As our body gets older it starts to work less efficiently - the same is true for dogs. Your dog's heart or kidneys may not work as well as they once did, or your dog may develop growths on the skin or inside his body. Your vet will be able to help you manage these conditions as long as he sees your dog before the disease becomes too advanced. If you are concerned about the health of an older dog, make an appointment to see your vet as soon as possible.