_{This article is intended for educational purposes and is not a substitute for veterinary diagnosis or treatment. Work with your veterinarian to develop a parasite-management and treatment program appropriate for your goats and your farm.}

Goat Parasites: Worms, Symptoms, Testing & Management

Parasites are a common part of raising goats, particularly animals kept on pasture. Most goats will encounter parasites at some point, and the goal of parasite management isn’t necessarily to eliminate every parasite. Instead, the goal is to prevent parasites from causing significant disease while preserving the effectiveness of the treatments available to us.

Heavy parasite burdens can contribute to poor growth, weight loss, diarrhea, anemia, bottle jaw, reduced production and, in severe cases, death. Even when parasites don’t cause obvious illness, they can affect growth, body condition and performance.

Different parasites affect goats in different ways, which is why there isn’t one symptom, test or deworming schedule that works for every situation.

A good goat parasite-management program combines observation, testing when appropriate, targeted treatment, pasture management, biosecurity and consistent records.

Internal vs. External Parasites in Goats

Goat parasites generally fall into two broad categories:

Internal parasites live inside the goat, often in the gastrointestinal tract or other organs. These include barber pole worm and other gastrointestinal worms, coccidia, tapeworms, lungworms and flukes.

External parasites live on or around the skin. Lice, mites and ticks are common examples.

Internal gastrointestinal parasites are the primary focus of this guide because they account for some of the most significant parasite-management challenges in grazing goats. However, external parasites are also important to recognize.

Common Goat Parasites at a Glance

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The signs listed here are general examples rather than a diagnostic tool. Several parasites can produce similar symptoms, and goats may carry more than one parasite at the same time.

Common Internal Parasites in Goats

Barber Pole Worm (Haemonchus contortus)

Barber pole worm is one of the most important gastrointestinal parasites affecting goats. Adult barber pole worms live in the abomasum, one of the compartments of a goat’s stomach, where they feed on blood. Heavy infections can cause significant blood loss and severe anemia.

Common signs can include:

• Pale lower eyelids and other mucous membranes
• Weakness or lethargy
• Poor body condition
• Weight loss
• Bottle jaw
• Reduced performance
• Severe deterioration or death in serious infections

One important characteristic of barber pole worm is that diarrhea is not typical of a pure infection. A goat can have a serious barber pole worm problem while continuing to produce normal-looking fecal pellets. Barber pole worm is also particularly important because resistance to commonly used dewormers is widespread.

Related guide: Barber Pole Worm in Goats: Symptoms, Testing & Treatment

Other Gastrointestinal Worms

Barber pole worm gets much of the attention, but several other gastrointestinal nematodes can infect goats. These include parasites such as Teladorsagia, Trichostrongylus, Nematodirus, Oesophagostomum and others. Depending on the parasite and severity of infection, gastrointestinal worms may contribute to:

• Weight loss
• Poor growth
• Reduced appetite
• Diarrhea
• Poor body condition
• Reduced production or performance

Mixed infections are possible, meaning a goat can carry several types of gastrointestinal parasites at the same time. Routine fecal examinations can detect many of these infections, although the eggs of several gastrointestinal worms look similar under a microscope and may simply be reported as strongyle-type eggs.

Coccidia

Coccidia are often discussed alongside goat worms, but coccidia are protozoan parasites, not worms. Coccidiosis is particularly important in young goats. Kids can be exposed to coccidia from contaminated environments, and disease is more likely when animals experience heavy exposure, crowding, stress or unsanitary conditions.

Clinical coccidiosis can cause:

• Poor growth
• Reduced appetite
• Pasty feces or diarrhea
• Weight loss
• Dehydration
• Weakness
• Bloody diarrhea in severe cases

Adult goats can carry and shed coccidia without showing obvious disease, so finding coccidia in a fecal sample doesn’t automatically mean coccidiosis is causing an animal’s symptoms. Age, clinical signs, environmental conditions and fecal findings all matter when interpreting the result.

Tapeworms

Tapeworms can be particularly alarming because segments may sometimes be visible in a goat’s manure. However, seeing a tapeworm doesn’t necessarily mean the goat is seriously ill.

Moniezia species are common tapeworms of small ruminants and are generally considered relatively nonpathogenic. Heavy infections may occasionally contribute to gastrointestinal problems or poor condition, but tapeworms are often less clinically important than parasites such as barber pole worm.

This is a good example of why the parasite that is easiest to see isn’t necessarily the parasite causing the greatest health risk.

Other Internal Parasites

Goats can also be affected by other internal parasites, including lungworms and flukes. Which parasites are important on a particular farm depends on factors such as geography, climate, rainfall, grazing environment, stocking density and previous parasite exposure. Local veterinary and Extension guidance can be particularly valuable when determining which parasites are important in your area.

Common External Parasites in Goats

Not every goat parasite lives inside the animal. External parasites can cause significant skin irritation, hair loss and discomfort, and some can contribute to other health problems.

Lice

Goats can be affected by both biting and sucking lice. Signs of lice can include:

• Frequent scratching or rubbing
• Hair loss
• Rough or damaged coat
• Visible lice or eggs in the hair
• Skin irritation

Heavy infestations of blood-feeding sucking lice can also contribute to anemia, particularly in vulnerable animals.

Mites

Mites can cause mange and other skin problems. Affected goats may show:

• Intense itching
• Rubbing
• Hair loss
• Crusting or scabbing
• Thickened or irritated skin

Several types of mites can affect goats, and diagnosis may require examination of skin scrapings or other samples by a veterinarian.

Ticks

Ticks attach to the skin and feed on blood. A small number may cause little more than local irritation, while heavy infestations can contribute to blood loss and skin damage. Ticks can also transmit certain infectious diseases depending on geographic location and tick species. Regular hands-on examinations can help identify external parasites that may be difficult to see from a distance.

What Are the Signs of Parasites in Goats?

Parasites don’t produce one universal set of symptoms. The signs depend on which parasite is involved, how heavily the animal is infected, the goat’s age and condition, and whether other health problems are present.

Possible signs of parasite problems include:

• Weight loss
• Poor body condition
• Reduced growth
• Rough or poor-quality hair coat
• Diarrhea
• Fecal soiling
• Pale eyelids or mucous membranes
• Bottle jaw
• Weakness or lethargy
• Reduced appetite
• Reduced production or performance
• Itching or rubbing
• Hair loss or skin irritation

The pattern of signs can provide clues. For example, anemia and bottle jaw are particularly important signs when barber pole worm is a concern. Diarrhea and poor growth may occur with other gastrointestinal worms or coccidiosis. Itching, rubbing and patchy hair loss point toward a different problem and may warrant checking for external parasites.

A young kid with severe diarrhea presents a very different parasite question from an adult goat with formed feces, pale eyelids and bottle jaw. That’s why it’s more useful to evaluate the whole animal than to look for one universal “sign of worms.”

How Do You Check a Goat for Worms?

There isn’t one test or observation that can tell you whether a goat has every type of internal parasite. Instead, parasite assessment usually combines physical signs, changes in the animal’s condition, and, when appropriate, fecal testing.

Signs that may warrant a closer look include:

• Pale lower eyelids or other signs of anemia
• Bottle jaw, or swelling beneath the lower jaw
• Unexplained weight loss or declining body condition
• Diarrhea or fecal soiling
• Poor growth in young goats
• Reduced appetite, energy, or productivity

Tools such as FAMACHA© can help assess anemia associated with barber pole worm, while the Five Point Check© provides a broader framework for evaluating physical signs that may be associated with parasites.

Fecal examinations and quantitative fecal egg counts can provide additional information about parasite eggs or oocysts being shed in manure. However, no single symptom, FAMACHA score, or fecal egg count provides a complete picture of a goat’s parasite burden.

For a step-by-step approach to evaluating an individual animal, including checking the eyelids, jaw, body condition, tail and manure, and using fecal testing, read our ⁠How to Check Goats for Worms guide.

Related Goat Parasite Guides

For more detail on specific parasite assessment methods:

• FAMACHA Score for Goats: What It Means & How It’s Used
• Bottle Jaw in Goats: Causes, Symptoms & What to Do
• Goat Fecal Testing & Fecal Egg Counts: A Practical Guide

When Are Goats at Higher Risk for Parasite Problems?

Parasite risk changes throughout the year and throughout a goat’s life. Understanding when animals may be more vulnerable can help determine when closer monitoring is worthwhile.

Kids and Young Goats

Young goats are particularly vulnerable to some parasite problems because their immune systems are still developing. Coccidiosis is especially important in kids, particularly during periods of stress such as weaning, crowding, transportation or environmental changes. Young goats may also require closer monitoring as they begin grazing and become increasingly exposed to gastrointestinal worms.

Does Around Kidding and Lactation

Parasite egg shedding can increase around kidding and early lactation in some animals. This period can coincide with substantial nutritional demands, making closer observation of susceptible does useful. That doesn’t mean every doe should automatically be dewormed around kidding. Monitoring allows treatment to be directed toward animals that need it.

Warm, Moist Conditions

Temperature and moisture have a major influence on the development and survival of gastrointestinal parasite larvae on pasture. Warm, moist conditions can favor parasite development and increase exposure. The exact timing of peak parasite risk varies considerably by climate and location.

Short or Overgrazed Pasture

Infective gastrointestinal parasite larvae tend to be concentrated relatively close to the ground. As goats graze pasture shorter, they may be more likely to consume vegetation contaminated with infective larvae. Avoiding excessive grazing pressure can therefore help reduce exposure.

High Stocking Density

When many goats occupy a relatively small area, more manure—and therefore more parasite eggs—can be deposited within the grazing environment. Crowding can also increase exposure to coccidia, particularly among young animals.

Goats With a History of Parasite Problems

One of the best predictors that an animal deserves closer monitoring is often its own history. A goat that repeatedly develops poor FAMACHA scores, high fecal egg counts or clinical parasitism may require closer observation than herd mates that consistently remain healthy under similar conditions.

Should You Deworm Goats on a Schedule?

Routine calendar-based deworming of every goat is no longer recommended as the default approach to parasite control. Repeatedly exposing the entire parasite population to dewormers creates strong selection pressure for resistance. Imagine a parasite population containing both susceptible and resistant worms.

Susceptible parasites are killed
↓
Resistant parasites are more likely to survive
↓
Survivors reproduce
↓
Resistance becomes more common

Instead, modern small-ruminant parasite management emphasizes targeted selective treatment. The goal is to identify animals that actually require treatment rather than automatically treating every goat at the same time.

Treatment decisions may incorporate:

• FAMACHA
• Bottle jaw
• Body condition
• Weight and performance
• Other clinical signs
• Fecal testing
• Animal history
• Veterinary guidance

Leaving healthy animals untreated also helps maintain refugia—a population of parasites that has not been exposed to the dewormer. Maintaining susceptible parasites in refugia can help slow the development of resistance.

Dewormer Resistance in Goats

It’s common to hear someone say that their goats have “become resistant” to a dewormer. Technically, the goats aren’t becoming resistant. The parasites are. Dewormer resistance occurs when parasites survive treatment with a drug that would normally be expected to kill them. Resistance has been reported across the major classes of dewormers used against gastrointestinal parasites in small ruminants.

Resistance also varies between farms. A dewormer that remains effective against parasites on one farm may perform poorly against parasites on another. This is why asking for the single “best goat wormer” can be misleading.

The more useful question is: Which treatments are still effective against the parasite population on this farm? Fecal Egg Count Reduction Testing can help answer that question. Working with a veterinarian is particularly important when developing treatment protocols for goats because drug selection, dosing, withdrawal times and extra-label use can require species-specific veterinary guidance.

How to Reduce Parasite Problems in Goats

No single management practice will eliminate parasite problems. A sustainable program combines several approaches designed to reduce exposure, identify susceptible animals and preserve dewormer effectiveness.

Avoid Overgrazing

Many infective gastrointestinal parasite larvae are concentrated close to the ground. When goats are forced to graze pasture very short, they are more likely to consume forage near contaminated manure and ingest infective larvae. Goats naturally prefer to browse shrubs, brush and vegetation higher above the ground when those feeds are available. Maintaining adequate forage height can help reduce exposure while also protecting pasture productivity.

Use Pasture and Grazing Management

Rotational grazing can be useful, but simply moving goats from one paddock to another does not automatically eliminate parasites. Parasite eggs deposited in manure develop into infective larvae, and those larvae can survive on pasture for extended periods depending on temperature and moisture.

Effective grazing strategies may include:

• Moving animals before forage becomes too short
• Providing adequate pasture rest
• Avoiding excessive stocking density
• Using hay production as part of pasture rotation
• Incorporating cattle or horses into multi-species grazing systems where appropriate

Sheep and goats share many of the same gastrointestinal parasites, so alternating goats with sheep generally doesn’t provide the same parasite-breaking benefit as grazing with cattle or horses.

Local climate matters enormously. Parasite development and survival on pasture can differ substantially between regions, so grazing strategies should be adapted to local conditions.

Maintain Good Nutrition

Nutrition doesn’t replace parasite control, but it is an important part of an animal’s ability to cope with parasite challenge. Goats with inadequate nutrition or other health stresses may have less ability to tolerate parasitism. Providing appropriate nutrition for an animal’s age and production stage should therefore be considered part of the overall herd-health program.

Keep Housing and Feeding Areas Clean

Good sanitation is particularly important for reducing exposure to coccidia and other organisms spread through fecal contamination. Keep feeders and water sources positioned to minimize manure contamination, maintain dry bedding where possible, and avoid allowing manure to accumulate in heavily used areas.

Be Careful When Introducing New Goats

A newly purchased goat can bring more than new genetics into the herd. Incoming animals may carry internal or external parasites, including parasite populations with different patterns of dewormer resistance. Introducing resistant parasites can create a long-term problem for a farm even if the incoming goat appears healthy.

Monitor Higher-Risk Animals

Parasite risk isn’t evenly distributed across a herd. Young animals, does around kidding and lactation, and goats with a history of parasite problems may warrant closer observation depending on circumstances. Rather than assuming every goat has the same risk, pay attention to individual history.

Identify Repeat High Shedders and Susceptible Goats

Some animals consistently shed more parasite eggs or require treatment more often than others.

Identifying these animals can influence:

• Monitoring frequency
• Treatment decisions
• Breeding decisions
• Culling decisions
• Long-term herd parasite management

This is one of the areas where good records become particularly valuable.

Some Goats Handle Parasites Better Than Others

Put two goats on the same pasture and they won’t necessarily respond to parasite exposure in the same way. One animal may maintain good body condition and require very little intervention. Another may repeatedly develop anemia, produce high fecal egg counts or require frequent treatment.

There are two useful concepts here:

Resistance refers to an animal’s ability to limit parasite infection or reproduction.

Resilience refers to its ability to maintain health and performance despite parasite infection.

Genetics can play a role in parasite resistance, which means individual parasite history can eventually become useful for breeding and herd-selection decisions. But those differences are difficult to identify if the only record you have is: “I think we wormed that goat a couple times last summer.” Repeated observations tell a much more useful story.

Why Goat Parasite Records Matter

Parasite management generates a surprising amount of information.

You may have:

• FAMACHA scores
• Bottle jaw observations
• Body condition scores
• Weights
• Fecal test results
• EPG values
• Treatments
• Treatment dates
• Follow-up tests
• Pasture changes
• Notes from your veterinarian

Each piece provides a snapshot. Put them together and you get an animal’s parasite history.

That history can help answer questions such as:

• Does this goat repeatedly become anemic?
• Is this animal consistently a high egg shedder?
• How often does this goat require treatment?
• Did its fecal egg count decrease after treatment?
• Does the same problem return during the same season?
• Which animals in the herd rarely require intervention?

Those are much more useful management questions than simply asking whether a goat “has worms.”

Keep a Parasite History for Every Goat With FarmKeep

A useful parasite timeline might look like this:

• ‍April 10 — FAMACHA observation recorded‍
• April 12 — Fecal test performed‍
• April 13 — Treatment recorded‍
• April 24 — Follow-up fecal test‍
• May 8 — Body condition rechecked‍
• June 3 — FAMACHA rechecked

The individual records matter, but the real value comes from seeing the pattern.

FarmKeep lets you keep FAMACHA observations, fecal results, symptoms, treatments, notes and follow-up tasks together in each goat’s health history. Over time, you can see which animals repeatedly struggle with parasites instead of trying to reconstruct their history from memory.

When to Call a Veterinarian

Parasite problems can progress from a manageable herd-health issue to a medical emergency. Seek veterinary care promptly if a goat is showing serious signs such as:

• Very pale or white mucous membranes
• Severe weakness
• Difficulty standing
• Collapse
• Significant bottle jaw accompanied by illness
• Persistent or severe diarrhea
• Dehydration
• Rapid weight loss
• Rapid deterioration
• Failure to improve following treatment

A veterinarian can also help when fecal results are difficult to interpret, parasite problems repeatedly return, or you suspect that your dewormers are no longer working effectively.

FAQ

What are the most common worms in goats?

Goats can carry several gastrointestinal worms, including barber pole worm (Haemonchus contortus), Teladorsagia, Trichostrongylus, Nematodirus, Oesophagostomum and others. Which parasites are most important depends partly on geography, climate and management.

What are the signs of worms in goats?

Possible signs include weight loss, poor body condition, poor growth, diarrhea, pale mucous membranes, bottle jaw, weakness and reduced performance. Different parasites cause different signs, and some infected goats may initially show few obvious symptoms.

How do you check a goat for worms?

There isn’t one universal worm check. FAMACHA can assess anemia associated with barber pole worm, the Five Point Check evaluates several clinical signs, and fecal testing can detect parasite eggs or oocysts. Body condition, weight, symptoms and animal history also provide useful information.

Does a pale eyelid mean a goat has worms?

Not necessarily. Pale lower-eyelid mucous membranes can indicate anemia, and barber pole worm is an important cause of anemia in goats. However, anemia can have other causes, so eyelid color alone does not diagnose a parasite infection.

Can goats have worms without diarrhea?

Yes. Barber pole worm is an important example because significant infection can cause severe anemia without diarrhea. Normal-looking fecal pellets do not rule out internal parasites.

What does bottle jaw mean in goats?

Bottle jaw is swelling beneath the lower jaw caused by fluid accumulation. Severe gastrointestinal parasitism, particularly barber pole worm, can contribute to blood and protein loss that leads to bottle jaw, but other conditions can also cause similar swelling.

What is a fecal egg count?

A fecal egg count estimates the number of parasite eggs being shed in manure. Quantitative results are commonly reported as eggs per gram, or EPG.

What does EPG mean in goats?

EPG means eggs per gram of feces. It measures parasite egg shedding and should not be interpreted as the literal number of worms living inside the goat.

How often should goats be dewormed?

There is no universal calendar schedule appropriate for every goat. Modern parasite-management programs favor targeted selective treatment based on the animal’s condition and relevant monitoring rather than automatically deworming every animal at fixed intervals.

Should all goats be dewormed at the same time?

Routine whole-herd deworming is generally discouraged because it increases selection pressure for dewormer-resistant parasites. Targeted selective treatment leaves animals that don’t require treatment untreated, helping preserve refugia.

How do you know if a goat dewormer worked?

A Fecal Egg Count Reduction Test compares quantitative fecal egg counts before and after treatment. The change in egg shedding can help determine whether a dewormer remains effective against the parasite population on your farm.

Can goats become resistant to dewormers?

The parasites become resistant, not the goats. Resistant parasites survive treatment and pass those resistance traits to future generations, which can make a dewormer progressively less effective on a farm.

What are the most common external parasites in goats?

Lice, mites and ticks are among the external parasites goat owners may encounter. Signs can include itching, rubbing, hair loss, skin irritation or visible parasites. Because several skin conditions can look similar, persistent or severe skin problems may require veterinary diagnosis.

Sources & Further Reading

The following veterinary, university Extension and small-ruminant parasite-control resources were referenced in preparing this guide:

• American Consortium for Small Ruminant Parasite Control — Other Worms That Infect Small Ruminants
  
• University of Minnesota Extension — Managing Barberpole Worms in Sheep and Goats
  
• University of Maryland Extension — When Should I Deworm My Sheep/Goats?
  
• Penn State Extension — Prevent Parasites Through Grazing Management
  
• Penn State Extension — Does My Dewormer Still Work?
  
• MSD Veterinary Manual — Common Gastrointestinal Parasites of Small Ruminants
  
• MSD Veterinary Manual — Coccidiosis of Goats