Feed him by size and breed
First of all, remember to feed your animal the needed amount for its specific breed and size. You should know the exact amount of food you need to feed the dog depending on various factors. Check out what your pet’s ideal weight needs to be; if its current weight exceeds this, then you know that you aren't feeding it right. You can find out the ideal diet and proportions by consulting a vet.
Make him exercise on a regular basis
Try to make your pet exercise almost every other day. Walking, other types of physical exercise, and stimulation in general is vital for it on a daily basis. Walking is a great thing for a pet and in addition to helping it shed the pounds, will also vitalise it mentally and strengthen your bond with it. Make sure you know that small dogs also need to walk.
Exercise is more effective for some breeds than others. For this reason, you should check if taking your pet on a run every day or a walk will be good enough for helping it lose weight. If it is not enough, you can also use other types of exercise for helping it shed the pounds, like playing in the backyard, with a stick, a ball, or a Frisbee, etc.
Get a personal trainer for the dog
If you are too busy or are not fit enough to play or make the dog exercise, then hire a person who will walk your dog or run with it. Most pet sitting services provide this option, and a few services are experts in running with dogs. These people are known as personal dog trainers. You can search for them on Google in order to hire them.