Medical
Before you start to train your dog it is a good idea to make sure your dog is healthy. Unforeseen medical conditions may affect the way your dog responds to certain stimuli.
One such ailment that could affect your dog’s behaviour is hip dysplasia and related arthritic conditions. In the early stages these medical conditions could go unnoticed. If you are trying to teach your dog to sit and you try and force the dog to sit by pushing on his back-end this may cause severe pain to your dog. The pain may make your dog react by biting you.
Another medical condition that may affect your dog can be various skin diseases. Your dog may be prone to ear infection and suffer from allergies. The itch caused from the skin and the ear will cause your dog to scratch a lot. When not properly attended to your dog may then develop very bad body odour.