At 2 months old, this is most likely to be play biting. In a litter of pups, they will mouth each other, then squeal and yelp when the bite is too hard. This is known as learning bite inhibition. However, with a large breed like a Rottweiler, it's essential to teach bite inhibition yourself so the dog is not out of control when older. To do this, yelp when the dog nips, and if necessary, stop the game and leave the room so the puppy calms down. A great resource to to attend a puppy class so the trainer can give you extra guidance on how to do this.

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