Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to stop your dog from biting other people [title] Distinguish between aggressive or playful biting. [step] Most dogs and puppies engage in mouthing, nipping or play biting, which is normal. If this is the case, your playful dog will have a relaxed body that isn't tense or aggressive.

Ending1: Biting acts for affection, not aggression, and it can even be used in place of side bites or nipping. [title] Be able to identify aggressive demeanor patterns. Ending2: Think about your dog as a united front to the person that he is nipping or biting. For example, if your dog reacts to biting and bites you, it may mean he is in a more aggressive mode and wants to get away from you. Ending3: When he nips or bites, the puppy or dog won't show teeth or bite down hard. However, if your dog is aggressively biting, his body will be stiff, he'll show his teeth, and he'll bite quickly and hard. Ending4: [substeps] Aggressive dog may hold his arms high, places his ears back, and bite. Playful nipping is often accompanied by aggressive body language.

Answer format: ending1/ending2/ending3/ending4