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My male German Shepherd is suddenly aggressive and biting. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | unneutered | 1 year and 10 months old | 77 lbs

I've a male German Shepherd dog, aged 23 months. He's not neutered. He wasn't an aggressive dog. He lives with my parents. He is very close to my mother especially. This year my mother had been traveling quite often without him. Our relatives were paid to look after him. He started to show signs of aggression. He would only growl then. But now he has also bitten my mom four times really bad in the past one month, two of the times causing severe injury to her. We also have a female dog, spayed.

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1 Answer

Most Helpful Answer

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Answered By Penelope Graben, DVM

Veterinarian

Published on September 19th, 2019

Hello, German Shepherds are commonly aggressive and may require intense training and socialization to be good companion animals. It sounds like he has become quite a dangerous animal, especially to your mother. Please take his aggression seriously and do not allow small children or animals to be around him, as he has a history of severely hurting people. He also needs to maintain his rabies vaccinations to ensure he is not able to spread a fatal disease with his bites. I would recommend seeing a veterinary behaviorist, a good dog trainer, as well as pursuing neutering him. This will be the best way to try to make him a safe animal to live with. I hope this is helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.

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