What wormers are safe for border collies?

By Deanne

May 28, 2026

For most healthy Border Collie dogs, standard vet-approved worming treatments are generally safe when used at the correct dose for the dog’s weight and age. Common active ingredients considered safe include fenbendazole, praziquantel, pyrantel, and milbemycin oxime. Products like dog worming tablets, Itch Wormer offer fast-acting and safe ingredients to kill all common intestinal dog worms.

However, some Border Collies and related breeds can carry the MDR1 gene mutation, which may increase sensitivity to certain drugs, especially high doses of ivermectin. While low-dose ivermectin used in some heartworm preventives is often tolerated, products containing stronger ivermectin concentrations should only be used with your vet's advice. Not sure if you know if your Collie has the MDR1 genetic - Take a certified gene test to determine their sensitivity.

Puppies, pregnant dogs, elderly dogs, or dogs with liver disease may need specific worming schedules or adjusted medications. Always weigh your dog accurately and follow the instructions carefully, since overdosing can cause vomiting, diarrhoea, tremors, or neurological effects. Click here for symptoms of dewormer overdose in dogs.

Routine deworming every 3 is what our qualified vets at Itch recommend, but dogs that hunt, scavenge, or live with children may need worming treatment every month.

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What wormers are safe for border collies?