You should be able to know signs that can tell you whether your dog is sick or not. This is because, there may be times when he does not behave as well as you want him to be, due to a certain ailment.
With that, you should not punish him, but instead, get a veterinarian to check on his condition.
Training your dog with a leash and a collar
Some dogs may become uncomfortable whenever you put collar and leash on them. Thus, you should do it while your pet is still a puppy, so that he can get used to it early on.
Walk your dog around the house with a leash first, before taking him outside, so that you can train him properly.