A newly adopted, older adult dog may need potty training if it is not house broken. Dogs adopted from animal welfare societies may have lived in a puppy mill or a kennel for a long time. If the dog is older than seven years, it may need to go more frequently than a younger adult dog. An adult dog goes on average every six to eight hours, while a senior dog might need to go every four hours. Plan to spend a couple of weeks building the dog’s routine to potty train it successfully.