Does your dog have bad breath? The odor you smell is caused by an infection in your dog’s mouth. The most common cause of infection in your dog’s mouth is periodontal disease, which affects over 75% of dogs over 2 years of age. Periodontal disease progresses without intervention. Unresolved periodontal disease can spread beyond the oral cavity to involve organs, such as the kidneys, liver, and heart. The goal of periodontal therapy is to restore oral health and stop the infection that causes pain, tooth and bone loss, and organ damage. Dogs need their teeth cleaned regularly just as people do. Home dental care and regular periodontal therapy help to maintain oral health to ensure a healthy, pain-free pet.