Livestock

Fenbendazole for Cattle, Sheep, Goats & Swine

Last updated June 19, 2026

Across cattle, sheep, goats, and swine, fenbendazole is a workhorse against gastrointestinal nematodes and lungworms. For food-producing animals, withdrawal times and resistance management are essential parts of using it responsibly.

On this page What it treats Dosing & course Safety When to call your vet

What fenbendazole treats in livestock

In livestock, fenbendazole is widely used for:

Gastrointestinal roundworms (the major production-limiting parasites)
Lungworms
Certain tapeworms, depending on species and product

It's sold as granules, pellets/feed mixes, liquid drench, and pour-on or block forms depending on the species.

Dosing and the treatment course

Dosing is by body weight and differs by species and product form. Goats in particular often need veterinary-directed dosing because they metabolize many dewormers differently from cattle and sheep. Match the product to the species on the label.

Species	Typical uses
Cattle	GI nematodes, lungworms
Sheep	GI nematodes, some tapeworms
Goats	GI nematodes (often vet-directed dosing)
Swine	GI roundworms, lungworms, kidney worms

Always follow the label. The figures above describe common label guidance, not a prescription. Exact dosing depends on the specific product's concentration and your animal's weight. When in doubt, your veterinarian can confirm the right amount and schedule.

Withdrawal times matter

For any animal entering the food supply, you must observe the meat and milk withdrawal times printed on the product label — the minimum period between treatment and slaughter or milking. These vary by product and species, so read the specific label and keep records.

Slow resistance, don't speed it up

As with horses, fecal egg counts and refugia-based strategies help preserve effectiveness. Routine whole-herd deworming without testing accelerates resistance. Your veterinarian or extension office can help build a sustainable parasite-control plan.

Is it safe?

Fenbendazole has a wide margin of safety in livestock when used as directed, and serious reactions are uncommon. Mild, temporary digestive upset is the most frequently reported effect. Read the full safety and side-effect guide before treating, especially for pregnant, nursing, very young, or unwell animals.

When to call your veterinarian

Book a visit or call if your animal is very young or pregnant, has another illness, is on other medication, isn't improving after treatment, or shows anything beyond brief, mild stomach upset. A simple fecal test is the best way to confirm which parasite you're dealing with and whether it has cleared.