The size classification of dog breeds usually has the following categories:
Toy: Toy dog, adult dog weighs 2-7 pounds (0.9-3.2 kg).
Small: A small dog, with adults weighing between 7-22 pounds (3.2-10 kg).
Medium: Medium-sized dog, with adult dogs weighing between 23-55 pounds (10.4-25 kg).
Large: Large dogs, adults weighing between 56-100 pounds (25.5-45 kg).
Giant: A giant dog that weighs more than 100 pounds (45 kilograms) as an adult.
Please note that different dog breeds may have slightly different size classifications, and there may be different body sizes within the same breed. In order to ensure that your pet is in good health and well behaved, you should also take your pet to the veterinarian regularly for physical examination and consultation so that proper management and guidance of its diet, exercise, and care can be provided.