PupkeeperCaution
Flea and tick chewables overdose: what to do now
Eating extra flea and tick chews can upset a dog's stomach, and this drug group can cause tremors, wobbliness or seizures in some dogs.
If your dog ate or touched this, call your vet or a pet poison line now
United States
Poison lines in other countries: United Kingdom, Canada, Australia, New Zealand, Belgium, France, JM, PR, Singapore, Switzerland, TT, VI
Flea and tick chewables overdose and dogs: key facts
- Verdict
- Caution · Call your vet or a poison line
- What it can do
- Vomiting, diarrhea, muscle tremors, wobbly walking and seizures.
- What to do now
- Call your vet or a pet poison line now. All steps
- Sources
- Merck Veterinary Manual, FDA. Reviewed 9 October 2026.
What to do now
- Call your vet or a pet poison line now.
- Keep the box and bring it with you.
- Count how many chews are missing.
- Go to an emergency vet if your dog shakes, stumbles or has a seizure.
Don't
- Don't make your dog vomit unless a vet tells you to.
Symptoms to watch for
- Vomiting
- Diarrhea
- Muscle tremors
- Wobbly walking
- Seizures
Why
Most of these chews are isoxazoline drugs. They have wide safety margins at labeled doses, but the FDA warns they can cause nerve reactions, even in dogs with no seizure history.
Sources
- Merck Veterinary Manual: Isoxazoline Toxicosis in Animals
- FDA: Fact Sheet for Pet Owners and Veterinarians About Isoxazoline Flea and Tick Products
Guide reviewed 9 October 2026. Page updated 7 November 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.