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Biting, mouthing and nipping are natural behaviors to a puppy. She uses such behaviors to establish her place in the litter and to explore her world. To stop your young canine from nipping people, use a high-pitched, "Ouch!" and gently shake the ruff of her neck or use light pressure on the muzzle and firmly say, "No!"
This tip is ok,but what if there are no results?I have 3,5months old lab(male) and he bites the furniture even if i punish him.But the bigger problem is that he is biting my hands and legs constantly,sometimes with signs of agression.Sorry for my English grammar