Can my dog eat antibiotics?
No.
Unless your vet prescribed this exact medicine for this dog at their dose. Vets do use some of these, like Augmentin and Flagyl — but never a leftover human box.
Already ate it?
If they ate itGo to a vet now with the packet. If it was a TB tablet (isoniazid, Myrin, Rifinah), say so first — seizures can start within an hour or two. Don't make them vomit unless a vet tells you to.
Watch forVomiting, diarrhoea, drooling, not eating. After TB tablets: wobbliness, tremors and seizures, often within an hour or two. After a lot of Flagyl: head tilt, wobbliness, flickering eyes.
Thinking of giving it?
WhyMost antibiotics just upset the stomach in an overdose, but a few are dangerous: TB tablets (isoniazid) cause seizures, and one 300 mg tablet can be life-threatening for a dog. Large doses of Flagyl affect balance, and ciprofloxacin can harm a growing puppy's joints.
Where this comes from. Pet Poison Helpline — Isoniazid; Villar et al., Veterinary and Human Toxicology 1995 — isoniazid toxicosis in dogs (APCC data); Fitzpatrick Referrals / Tauro et al. 2018 — Metronidazole-induced neurotoxicity in 26 dogs; ASPCA Pro — Cold & Flu Medications in Pets.
Reviewed: 20 October 2026
A guide, not a diagnosis. If your dog seems unwell, call your vet.
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