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Why is my 5-month German Shepherd suddenly aggressive and biting?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | 4 months and 3 days old | 42 lbs

5month German shepherd for no reason started attacking my wife biting and snarling L was at work and she was petrified and when I returned sat down and did not move

1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on December 8th, 2017

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach. I am sorry to hear that this has happened. This behavior is certainly concerning as you don't want Boston to cause serious harm to your wife or anyone else for that matter. I would recommend taking Boston to a behaviorist for training and other recommendations. There are trainers that will take Boston for several weeks for the training or trainers that will come to your house for in home training. At 4 months of age, this is easier to correct than when he is 4 years old. Now is the time to take action as it is much easier to train a puppy. I hope this helps and for now, please take the necessary precautions and keep Boston away from anyone until he is appropriately trained.

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