The first factor is the size of your dog. Dogs come in all shapes and sizes, and each size requires different amounts of food. Generally, smaller dogs require less food than larger dogs do.

The second factor is how active your dog is during the day. If your dog spends most of his day running around outside, he will require more food than if he spends his day lounging around at home.

Finally, some breeds are naturally more active than others are and thus require more calories to maintain their weight.