Last reviewed: August 2026

Can Dogs Eat Mustard?

ToxicAvoid Entirely

Mustard seeds and prepared mustard should be avoided — mustard seeds contain compounds that are a genuine GI irritant, and prepared mustard often contains other additives that add further risk.

Why

Mustard seeds contain glucosinolates, which can cause significant gastrointestinal irritation, including vomiting and diarrhoea, particularly if a dog gets into a quantity of seeds (such as from a garden or spice container) rather than a small taste of a mustard-containing condiment.

What to do if your dog ate this

Keep mustard seeds and prepared mustard away from dogs entirely
If a dog eats a significant amount, watch closely for vomiting or diarrhoea and contact a vet if severe
A small lick of a mustard-containing condiment is a low but avoidable risk — there's no reason to offer it

Sources

General veterinary toxicology consensus, cross-referenced against the Merck Veterinary Manual and ASPCA Animal Poison Control Center food hazard references. See How We Source This for our methodology.

This page is general educational information, not a substitute for veterinary advice.