Biting Over Possessions
Some breeds of dogs have amazing bit inhibitions when it comes to people. For other dogs, biting is a way a dog can communicate things such as 'that's mine so leave it alone.' The dogs will use biting to communicate to other dogs, and unless taught otherwise, to communicate with people. With a dog who bites and nips people when protecting possession, you can train the dog to relinquish those possessions on command. That training will resolve the possession biting issues. Two commands that help achieve that are 'drop it' and 'leave it.' You can learn how to train for those commands from a lot of dog training books. In Training the Hard to Train Dog, you will find how to train those commands on pages 91-93.

Nippy Puppies
Most puppies learn a lot of manners when from their littermate. Those social skills help the dog learn how to better get along in his or her human pack. Sometimes, a puppy that was taken away from a litter too young, before eight weeks of age, may need taught bite inhibition. When working with this kind of problem, you don't want to smack a pup that bites you. Instead you can try doing something similar to what his or her littermate would do. Say a sharp, 'ouch' and then turn you back on the puppy. If the puppy stops biting, go back to your interactions. If the puppy tries to bit you again, after you say 'ouch' in your sharp and loud voice, walk away. Teach the puppy that too hard of nipping means no more interactions. If you have a puppy that persists when you try this technique, you can find more things to try in the book Training the Hard to Train Dog on pages 203-208.

Biting on When You Run
Some dogs with a higher predatory drive, such as herding breeds, may nip and bite at you when you run. To help solve that kind of an issue, follow the training techniques on page 208 in Training the Hard to Train Dog.

Aggression Towards Other Dogs in the Household
Dogs attacking other dogs in the household can seem to suddenly appear even though the dogs seemed to get along for months or even years. This issue actually didn't suddenly appear, but grew over a period of time. Typically, you slowly lost your leadership status to a more 'take charge' kind of dog. With the dog feeling more in charge than you, one day, the dog began to use aggression towards other pack members.

To resolve this problem, you need to restructure your relationship with the dog the same way you lost your leadership, piece by piece. Some of the training which helps begins by first having the dog trained to sit and stay. If you haven't trained this you will find information in Training the Hard to Train Dog on 'training the basics' starting on page 61. Once the dog sits and stays reliably, you use that training to secure impulse control. You also need to teach the dog the “watch” command. This command teaches the dog to give you eye contact in order to get what the dog wants. When a dog does this command the way described in the book, the dog must acknowledge your leadership status. Some dogs may resist doing the watch command for that reason. That is why you will find a lot of explanation and an example on how to accomplish this with a more difficult dog on pages 76-81 in Training the Hard to Train Dog. Once you get the 'watch' command under control, you team that up with impulse control to teach the dog to check in with you before the dog acts. This literally teaches the dog to listen to your command to stop should that dog take after another dog with aggressive intentions. That training helps to turn around your dog's behavior while you work to step into a stronger leadership role. As a longer leader, your dog will learn to call off instead of attack another canine member in your household. In the case studies in the last chapter of the book Training the Hard to Train Dog, you can read how this training was used to reform a dog named Chamois who previously attacked another canine member in the household.