Is 100% peppermint oil harmful to dogs? If not, does it offer any nutritional benefits to canines?
Oils such as peppermint can cause oral, skin and gastrointestinal irritation—if swallowed in large quantities, central nervous system depression may occur as well. Due to its potential for problems, we would not recommend giving peppermint oil to your dog. If you’re looking for a supplement to support your dog's health, we advise communicating with your local veterinarian to get a recommendation for an appropriate product.