Goat/Sheep Dewormer Dosing Calculator
Weight-based dosing for common dewormers, sourced directly from veterinary extension dosage charts.
How this calculator works
Each dewormer has a published dose rate in mg per kg of body weight, and each product has a known drug concentration (mg per mL). This tool converts your animal's weight to kilograms, applies the dose rate, and divides by the product's concentration to get the volume to administer.
A note on albendazole and pregnancy
Albendazole (Valbazen) should not be used during the first trimester of pregnancy — it has been linked to birth defects in early gestation. If you're unsure how far along a pregnant doe or ewe is, choose a different drug class or check with your vet first.
Where these numbers come from
- Goat and sheep dosage charts: NC State University Cooperative Extension (Southern Consortium for Small Ruminant Parasite Control); Cornell University College of Veterinary Medicine; Langston University Goat Extension; University of Georgia (Dr. Ray Kaplan, DVM/PhD)
- Meat and milk withdrawal times: same extension/veterinary sources; always verify against the current product label, as withdrawal times are occasionally updated
This tool is an extension-sourced dosing reference, not a substitute for a veterinarian's diagnosis, a fecal egg count to confirm you actually need to deworm, or drug-resistance testing in your herd.
Frequently asked questions
Why is dosing based on weight so important for dewormers?
Underdosing lets parasites survive and pass on resistance genes, while overdosing wastes product and can stress the animal — accurate weight-based dosing from veterinary charts is the standard practice specifically to avoid both problems.
How should I actually weigh my goat or sheep?
A livestock scale is most accurate, but a weight tape or a height/heart-girth estimation formula are common, practical substitutes when a scale isn't available — just avoid guessing by eye, since that's a common source of dosing error.
Why does resistance keep coming up with dewormers?
Parasites that survive an underdosed treatment can pass resistance to their offspring, and over years of imprecise dosing across a herd or flock, that resistance builds up — accurate dosing is one of the few tools producers have to slow that process down.
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