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Is Ivermectin horse paste Safe for Dogs?

☠️ Toxic
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just ate or touched something and looks unwell, skip the reading and call your vet — or Pet Poison Helpline (US): (855) 764-7661, ASPCA Poison Control (US): (888) 426-4435.
No. Ivermectin horse paste can fatally poison dogs, especially herding breeds with the MDR1 mutation — any exposure is an emergency.

Why it’s a problem

Horse paste is dosed for animals weighing hundreds of pounds, so a lick delivers many times what a dog’s body can handle, and dogs are attracted to its sweet carrier. Overdose causes drooling, dilated pupils, stumbling that looks like blindness, tremors, and then coma. Herding-breed dogs — Collies, Australian Shepherds, and related crosses — may carry the MDR1 gene mutation, which lets ivermectin flood the brain and makes poisoning far more likely and more severe.

How to keep your pet safe

Never store horse dewormers where dogs can reach them — barn and tack-room shelves are prime investigation zones. Never self-dose a dog with ivermectin products; even using a horse product on a large dog can be lethal, and herding breeds need testing and veterinary direction. If you own a Collie or Aussie-type dog, ask your vet about MDR1 testing.

Warning signs to watch for

Drooling, dilated pupils, stumbling, apparent blindness, tremors, slow breathing; progression to seizures, coma, and death without care.

When to call the vet

Treat any exposure as an immediate emergency — call a veterinarian or pet poison hotline with the product, the amount missing, and your dog’s breed. Mention herding heritage specifically, since it changes the risk level dramatically.

Common questions

My Collie licked ivermectin horse paste — what now?

Collies and other herding breeds are among the most ivermectin-sensitive dogs because of the MDR1 gene mutation, so treat this as an immediate emergency. Call a veterinarian or pet poison hotline right away, before symptoms begin.

Can I dose my dog with horse ivermectin paste?

No. Horse paste is concentrated for animals many times a dog’s weight, and guessing a dose has killed dogs. Deworming should only be done with veterinary direction.

More medications hazards for dogs

🐶 Ibuprofen (Advil, Motrin)☠️ ToxicNo. Ibuprofen is toxic to dogs even in small amounts — never give it, and treat any swallowed pi🐶 Acetaminophen (Tylenol, Paracetamol)☠️ ToxicNo. Acetaminophen damages a dog’s liver and red blood cells — never give it without veterinary d🐶 Naproxen (Aleve)☠️ ToxicNo. Naproxen is highly toxic to dogs even in small amounts — treat any swallowed tablet as an em🐶 Aspirin🚫 Not SafeNot on your own. Aspirin can cause stomach ulcers and bleeding in dogs and should only ever be u🐶 Diclofenac gel (Voltaren)☠️ ToxicNo. Diclofenac gel is a strong NSAID, and licking it off skin or chewing a tube can seriously po🐶 Celecoxib (Celebrex)☠️ ToxicNo. Celecoxib is a human NSAID, and a swallowed capsule can cause stomach ulcers and kidney dama

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).