Genetics
The genes that a dog inherits from its parents will play a major role in determining its adult size. Some breeds, such as Great Danes and Saint Bernards, are naturally large, while others, such as Chihuahuas and Toy Poodles, are naturally small.
Nutrition
A puppy that is fed a healthy diet that is appropriate for its age and activity level will be more likely to reach its full growth potential. Puppies that are fed a diet that is too high in calories or fat may become overweight or obese, which can stunt their growth.
Environment
The environment in which a puppy lives can also affect its growth. Puppies that are raised in warm, humid climates may grow faster than puppies that are raised in cold, dry climates. Puppies that have access to plenty of exercise will also be more likely to reach their full growth potential.
Signs that a dog has stopped growing
There are a few signs that a dog has stopped growing:
* The dog's weight stabilizes.
* The dog's height stops increasing.
* The dog's feet stop growing.
* The dog's body proportions become more adult-like.
If you are concerned about whether or not your dog has stopped growing, you should talk to your veterinarian.