Petco Text Logo
Petco Pet Logo

Why is my German Shepherd suddenly aggressive and growling at his mom?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | unneutered | 3 years and 3 months old

My German Shepherd Mix seems to be getting easily agitated which sometimes seems really aggressive. He wasn't like this before because he used to play a lot with his mom but now when the mom tries to play, he growls at her. And when we're petting him and the mom gets near he starts growling which he never did. What it is the problem?

1 Answer

Most Helpful Answer

Image profile

Answered By Sara Farmer, DVM

Veterinarian

Published on March 22nd, 2019

I'm wondering if Bruce's mother is spayed - if not it could have something to do with heat cycles. It can be really difficult to pinpoint exactly what has caused a behavior change but I always recommend an exam with a veterinarian first when there is a sudden change to look for a medical problem. Bruce could have pain somewhere or be otherwise ill. If he seems to be in good health your vet can discuss training or refer you to a behaviorist in your area.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored