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Why does my dog suddenly freeze, stare, and attack other dogs?

Updated On September 23rd, 2025

Pet's info: Dog | American Staffordshire Terrier | Male | neutered | 1 year and 5 months old | 26 lbs

Sometimes my dog will be inside acting normal and all of a sudden he will just freeze and stare then attack one of the other dogs and there is no obvious thing that happens before he snaps I was wondering if you knew why he would do this? Or if it is possibly a mental issue rather than behavioural?

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on June 23rd, 2017

In most cases, there is indeed a trigger for aggressive behavior like this - even if you aren't able to tell what it is. A skilled trainer or behaviorist could likely help you determine what is triggering it, so I would definitely recommend making an appointment with someone who can evaluate Viktor in person - he/she can also put together a detailed training plan for you to work on the problem. In the rare cases that there truly is no discernable trigger, it is possible for aggressive behavior to be linked to a neurologic disease such as a brain tumor - but this is very uncommon in my experience. The vast majority of aggressive dogs have a behavioral reason for there aggression, even if it is subtle and not easy to identify at first. This is where a professional can be very helpful :)

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