If you buy a special mouthwash for pets, it will generally not cause harm to dogs. But when using mouthwash for dogs, you need to pay attention to the following two points. First, pay attention to the frequency of gargling, usually once a week. If it is too frequent, it will easily lead to disorder of oral flora and affect the oral health of dogs. Second, the owner needs to dilute the mouthwash according to the instructions.