How to Potty Training Your Dog or Puppy. Potty training a dog is very important to most people, no one wants to be constantly cleaning up after their dog in their house. It ruins carpets, floors and just plain stinks! While it’s best to start potty training with a young puppy, it’s not too late if you’re having trouble with an older dog. Here are some steps to help you potty train your dog or puppy.