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My dog attacks new dogs. How can I stop aggression and train him?

Updated On September 23rd, 2025

Pet's info: Dog | Catahoula Leopard Dog | Male | neutered | 2 years and 5 months old | 65 lbs

I adopted Stitch a month ago. He did very well with my other dog and dogs at the park. But I’m dog sitting a lab for three months, and he attacked her on the spot. Every time he sees her he gets upset and attacks. He is dominant and territorial. How can I help him adjust to having her around? I want to be able to leave them alone without worrying, but I can’t even let him around her on a leash. If he’s this aggressive, do I need to give him back to the rescue? Is there any training?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on August 3rd, 2018

You'll need to gradually introduce them. Separate them completely for several days, begin by having them hear and smell one another through a closed door. Correct any negative behavior immediately and praise good behavior. Progress to allowing Stitch to see but not have contact with the Lab. Again, correct negative responses/behaviors immediately. The next step would be to allow a controlled physical introduction. The safest method would be to have one of the dogs in a closed crate or pen. A pheromone product, such as the Adaptil collar or DAP plug in diffuser, may decrease any anxiety or aggression while acclimating them.

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