My 4-month-old lab puppy bites everything including my hands, furniture, shoes, and the kids arms. We have tried saying no but it is not working.
At 4 months, your puppy is in the peak teething phase and biting everything is completely normal behavior, not aggression. But you are right to address it now. Simply saying "no" does not work because it does not teach the puppy what to do instead. Here is the method that works. When the puppy bites your hand, immediately yelp loudly in a high pitch (mimicking what a littermate would do) and completely stop interacting for 30 seconds. Turn away, cross your arms, give zero attention. After 30 seconds, resume play. If the puppy bites again, yelp and withdraw again. This teaches the puppy that biting ends the fun. Consistency is absolutely critical and every family member must respond the same way every single time. Always have appropriate chew toys within reach and immediately redirect biting to the toy. Frozen washcloths and rubber Kong toys stuffed with peanut butter are excellent for teething puppies. For furniture and shoes, use bitter apple spray which tastes terrible to dogs. Make sure the puppy is getting enough exercise and sleep. Over-tired puppies bite more. At 4 months they need 18-20 hours of sleep per day. If the biting does not improve by 6 months, consider a professional puppy training class.
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