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Animal health · veterinarian-informed

Coccidiosis in animals, explained clearly.

From puppies and kittens to goats, calves, and backyard flocks, coccidiosis is a common parasite that hits young animals hardest. Learn to spot it, treat it, and stop it coming back — with a dosage calculator built on published veterinary references.

Start with the basics Dosage calculator
10species covered
4anti-coccidial drugs
1goal: healthy animals

Anti-coccidial dosage reference

Reference
Educational reference only — not a prescription. These are typical published label / reference figures, shown for information. They are not a recommendation to use any specific product, and several of these drugs are not FDA-approved for animals in the U.S. Coccidiosis must be diagnosed by a veterinarian, who determines whether treatment is appropriate and confirms the exact dose, frequency, and any withdrawal time.
The essentials

Four things every animal owner should know

Coccidiosis is an intestinal disease caused by microscopic coccidia parasites — a common threat to young and vulnerable animals across many species.

What it is

A parasite of the gut lining, picked up from oocysts in contaminated soil, water, or feces. Young and stressed animals are most affected.

Learn more

Recognizing it

Diarrhea (sometimes bloody), poor growth, dehydration, and lethargy — especially in the young after weaning, transport, or stress.

See symptoms

Treating it

Antiparasitic drugs — toltrazuril, amprolium, sulfa drugs, diclazuril — plus fluids and supportive care. Early action matters most.

Treatment options

Preventing it

Clean, dry housing, stress reduction, and careful monitoring are the best defense against outbreaks and reinfection.

Prevention & care
Choose your animal

Species-specific guidance

Coccidia are host-specific — each animal has its own parasites, symptoms, and best treatments. Pick a species for tailored information.

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In plain terms

Everything animal owners need to know

Coccidiosis is an infection caused by coccidia parasites that live in the intestinal tract. Animals become infected by swallowing coccidia oocysts — the parasite's hardy "eggs" — from contaminated soil, water, feed, or feces. The disease is most common and most severe in young or immunocompromised animals, whose defenses are still developing.

Management centers on specific anti-coccidial drug classes — sulfonamides such as sulfadimethoxine, amprolium, and the triazines toltrazuril and diclazuril — alongside supportive care like hydration and nutrition. Which drug is appropriate depends on the species and the diagnosis, and some are not FDA-approved in the U.S., so the choice, dose, and course should always be directed by a veterinarian.

Not sure where to start?

A veterinarian can confirm the diagnosis and advise on whether treatment is appropriate for your animal — and prescribe it when it is. Vetr connects you with licensed veterinarians.

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Answers

Still have questions?

Clear answers to the questions animal owners ask most.

Is coccidiosis contagious between animals?
Yes, but generally only within the same species. A dog cannot catch it from a goat, and a chicken cannot pass it to a calf. Shared, contaminated environments spread it rapidly among animals of the same type.
Can coccidiosis be fatal?
In severe or untreated cases — especially in young or weak animals — it can cause dehydration, gut damage, and death. Early treatment and supportive care greatly improve the outcome.
Can humans get coccidiosis from animals?
The coccidia species that infect farm animals and pets are host-specific and are not considered a meaningful risk to people. Routine hand-washing and clean-up are still good practice.
How is coccidiosis diagnosed?
A veterinarian confirms it with a fecal flotation test that finds and often identifies the coccidia. Because diarrhea has many causes, testing prevents mis-treatment.
See all FAQs
Coccidiosis.com × Vetr

Get a diagnosis you can trust.

Coccidiosis should be confirmed by a veterinarian, who can advise on the right approach for your animal. Vetr offers licensed veterinary consultations.

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Educational information only — not veterinary advice, and not an offer to sell any product. Coccidiosis.com provides general educational information about animal health and does not diagnose, treat, or prescribe. Some medications discussed (including toltrazuril and diclazuril) are not approved by the U.S. FDA for use in animals, and others are approved only for specific species; any use must be determined and supervised by a licensed veterinarian, who can also advise on correct dosing and withdrawal times. Always consult your veterinarian before using any medication.