Veterinary Drug Dosage Calculator
Search a drug, pick a species, enter a weight — get an evidence-based dose range with the citations behind it. Built for clinicians treating dogs, cats, reptiles, birds, pocket pets, livestock, and equine patients.
Try it free right here — no account needed for 3 dog & cat calculations a day. A free account covers 10 a day; Pro and Student tiers unlock the exotic, livestock, and equine formulary.
Try it free
Dog & cat dosing · no account neededReference only. Verify against current literature before clinical use.
How it works
- 1. Search a drug. Type any portion of the generic or brand name. The autocomplete covers 1,000+ entries spanning antimicrobials, analgesics, anti-parasitics, anesthetics, GI drugs, endocrine therapies, and more.
- 2. Pick a species. Only species with curated dose rules for that drug appear, so you can never reach a “no rule found” dead-end. Reptiles, birds, pocket pets, livestock, and equine are all first-class citizens — not afterthoughts to a dog/cat formulary.
- 3. Enter weight. kg, lbs, or grams — the calculator converts. Out-of-range weights against the species' typical band trigger a warning, not silent acceptance.
- 4. (Optional) enter concentration. For injectables and oral suspensions, the calculator returns both a dose range (mg) and a draw-up volume (mL) — the number you actually need at the patient.
- 5. Read with citations. Every result shows the source citation, the evidence level, and any species-specific or breed-specific warnings (e.g. ivermectin in MDR1 collies, oral beta-lactams in rabbits).
What's covered
18 species, 3,206 rules
Rabbit, ferret, guinea pig, chinchilla, hedgehog, rat, bearded dragon, ball python, and African grey parrot — plus dogs, cats, and full livestock and equine coverage (horse, cattle, sheep, goat, swine, chicken, turkey). Exotic-first, in one formulary.
Evidence-tiered dosing
Strong / Moderate / Weak / Extrapolated badges so you can tell a published clinical trial from a textbook extrapolation at a glance.
Volume + dose
Add concentration to convert mg → mL automatically. Useful for compounded formulations and small-patient dosing where the math is the actual error surface.
Cited, not invented
Every dose rule links to its primary source: peer-reviewed papers, Carpenter's, Plumb's, BSAVA, etc. We're a re-presenter of published guidance, not an authority of our own.
Related tools
Ready to calculate?
Sign in or create a free account. Free tier covers dog and cat dosing at 10 calculations per day. Pro is for clinics doing exotic, livestock, or equine work where 10/day fills up by lunch.