Although you’ve heard the saying, “You can’t teach an old dog new tricks,” in fact you can teach an old dog just about anything! It’s never too late to train a dog. Whether you are bringing home an older dog from a shelter (or rescue), or you’d like to work with your own older dog, there’s no reason to delay doing some training with an older dog. There are actually some advantages to working with an older dog. Older dogs may already know some commands. They have a much longer attention span than puppies.