Why do dogs' teeth fall out?

Dogs' teeth fall out due to various reasons, including dental disease, trauma, and aging. Dental disease, such as periodontal disease, is a common cause of tooth loss in dogs. Trauma, such as a hard impact or injury to the mouth, can also lead to teeth falling out. Additionally, as dogs age, their teeth may naturally become weaker and more prone to falling out. Regular dental care and check-ups can help prevent tooth loss in dogs.