Tips on Feeding an Adult Dog - as part of the expert series by GeoBeats. Some mistakes for feeding older dogs is that we do not really look at the age of the dog, or actually what the exercise level is, so we just kind of feed the dog the same thing. But senior dogs should get some form of a senior food, especially if they are not exercising as much. You know dDogs are just coming into social maturity, they might need to have more protein. Another mistake that people do is either they under feed their dogs and their dog is starving all the time and getting into trash cans and all that, or they are over feeding their dog. So you want to make sure, with your vet, that you know exactly how much your dog should be consuming at the age that they are and their exercise level.