Can dogs eat mint?

Peppermint and spearmint leaves are not considered toxic in small quantities. One or two chopped leaves on food is plenty for a medium dog. Eating a lot of mint can cause vomiting or diarrhea.

Mint spreads quickly in gardens, so dogs may graze on it; if your dog nibbles constantly, it is worth fencing the patch.

Pennyroyal (Mentha pulegium) looks similar to other mints and has a strong minty smell. It contains pulegone, which is toxic to the liver. Pennyroyal oil has historically been used as a flea repellent, and it has caused serious poisoning in dogs. Do not use pennyroyal plants or oil around your dog.

The mint family is large and includes catmint, lemon balm, basil and many garden ornamentals. Most culinary members are harmless in small amounts. Pennyroyal is the notable exception. If you are unsure what a minty-smelling plant in your garden is, check its name before letting your dog graze near it.

Sugar-free mints, breath strips, chewing gum and some toothpastes for people use xylitol as a sweetener. In dogs, xylitol can cause a sudden, dangerous drop in blood sugar within 30 to 60 minutes, and larger amounts can damage the liver. A single piece of some gums can harm a small dog. Keep handbags, coat pockets and bathroom cabinets closed.

Peppermint essential oil is concentrated and can irritate a dog's mouth, skin and airways. Mint dog treats made for dogs are formulated safely. Persistent bad breath usually points to dental disease.