Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train a puppy not to bite [title] React consistently to bites. [step] Every time your puppy bites, say " no! " in a firm voice. Then just walk away and ignore the puppy.

Ending1: Social isolation and time outs can be an effective form of punishment for a pack animal. You can also yelp when your puppy bites too hard. Ending2: Don't give it a chance to get you really upset because it bites. Just a few extra steps and the puppy will step back and wait for you to ignore it for a very short time. Ending3: [title] Create this' no' command in your training. [step] " don't bite " will help your puppy understand that biting is a good thing so that it can behave appropriately. Ending4: Or if you leave him alone, ignore him till he calms down. [substeps] If your puppy bites again, continue to ignore his biting until you see him learn not to bite.

Answer format: ending1/ending2/ending3/ending4