Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to stop dogs from biting [title] Keep a puppy with its mother and siblings for ten weeks. [step] Let your dog's original family shoulder some of the teaching load before your family takes over the job. [substeps] For dogs, as with other animals including humans, an important function of play is instruction.

Ending1: This sets up the structure of the puppy's body. Gradually add additional curriculum to these groups to further teach your dog effective play. Ending2: Puppies do not need constant sitting and waiting periods while they are left alone. Rather than consistently trying to teach the dogs to sit, they should consistently get practice with their owners, can ask for supervision, and can be comfortably held for hours on end without being bitten. Ending3: Puppies use yelps of pain and refusal to keep playing to instruct each other about the differences between playful mouthing and painful biting. Mothers likewise play an important instructive role in the formative weeks of a puppy's life, one that is hard to replicate or replace. Ending4: Puppies ought to learn a lot more quickly through their mother and siblings than from strangers. It is important you supervise your dog during the training as well, however, as puppies are often too young to let their mother make the cut at first.

Answer format: ending1/ending2/ending3/ending4