Approximately what percentage of dogs show signs of gum disease by age three?

• A. 60%
• B. 70%
• C. 80%
• D. 90%

Answer: (C)

Gum disease in dogs is extremely common as they reach early adulthood. Plaque buildup begins a cascade from gingivitis to periodontal disease, and by the time many dogs are three years old, signs are present in a large majority. About 80% is a widely cited figure in veterinary dentistry, reflecting that most dogs have at least some level of periodontal involvement by age three. Early signs like red, swollen gums, tartar, and bad breath are common, and if left untreated can progress to more serious tooth and bone loss. Because it’s so prevalent, preventive dental care—such as regular brushing, dental chews, and routine professional cleanings—is recommended starting in puppyhood. That’s why the approximately 80% estimate best fits what’s typically observed.