Mustard is toxic for dogs
Mustard should not be given to your dog. While a small lick of mustard may not cause any issues, mustard is made from mustard seeds which can cause problems. Mustard seeds can cause severe gastroenteritis and vomiting if eaten. Prepared mustard may contain other ingredients which can be toxic to dogs such as garlic powder. Garlic can damage a dog’s red blood cells if eaten in large quantities.