Four years old for a dog is equivalent to 34-36 years old for humans. Dogs are in their middle age, and their physical functions are at their peak. A 4-year-old dog should eat scientifically and exercise actively, which is good for health. In terms of diet, it is best to feed dog food mainly, and it is best not to feed people food.

When a dog is 7 years old, the functions of various parts of the dog's body are declining at this period. The dog's body needs to be checked regularly, such as blood routine, stool routine, etc.