Mint Leaves Pluck a few mints leaves off the plant and let your dog chew on them. You can also mix fresh mint leaves with water to make a mouthwash for your pup. However, wash the leaves thoroughly to remove any pesticides or chemicals. Mint Essential Oils Add a few drops of mint essential oil to your dog's water bowl. You can also add a few drops of oil to their food if they have trouble eating due to an upset stomach. However, use a high-quality, diluted essential oil since pure essential oils are toxic to dogs. Mint Candies Avoid feeding your dog mint candies since they often contain xylitol, which is poisonous to dogs. In addition, sugary candy can cause cavities and weight gain. If you want to give your dog a minty treat, opt for dog-friendly breath mints that don't contain xylitol. If you opt to give your dog mint candies for bad breath, crush them up into tiny pieces. This prevents dogs from choking on them. In addition, monitor your dog closely since it may experience an upset stomach or diarrhea. Mint Leaves Tea Brew a cup of mint tea and let it cool before giving it to your dog. Add a little honey to sweeten the tea if desired. Mint Powder You can also buy mint powder at health food stores. Mix the powder with water to make a paste and brush it onto your dog's teeth.