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Why is my dog aggressive at daycare, attacking dogs and staff?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | spayed | 75 lbs

I work at a dog daycare and my dog comes with me. She was good.She plays in group play 1-2 times for 2 hours. She now tries to run out. She's becoming aggressive in the facility. When I walk dogs with her, she randomly attacks them, but she's fine with them outside. She now walks alone. Including her, dogs bark/show aggression when dogs pass their rooms, so it can be a loud environment. In her room, my coworkers have told me she sometimes growls at them when they open her door to say hi to her.

1 Answer

Most Helpful Answer

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Answered By Jennifer Ladd, DVM

Veterinarian

Published on August 31st, 2017

I am concerned that she is developing a negative association with the daycare and other dogs. She may be getting overly tired, developing some protective aggression, or even some fear based aggression. I would recommend giving her a break from the facility with slow return with loads of positive reinforcement. In more severe cases you could also try some Trazodone. It is not a sedative, rather increases the amount of Serotonin in the brain. This results in a more content and happy pup. You could use this as a training tool while you are re-integrating her, and then wean her off as she has successful days.

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