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Why is my male dog suddenly attacking my female dog? What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | unspayed | 5 years and 2 months old | 65 lbs

My male dog has suddenly become very aggressive towards the other dog which is female a week back everything was fine but suddenly oblix attacked the other dog same thing happened 3 days back and it was a serious attack as if he wanted to kill her they are both very much loved and cared but more care is shown on the female she is allowed to sleep on the bed etc and oblix is not i am now afraid to leave them alone please tell me what to do as i dont want to loose any one of them here

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on May 25th, 2017

I'm sorry to hear that you're having this problem! Aggression between dogs in the same household is a complex behavior issue that can have many causes such as stress/anxiety, frustration, resource guarding, or redirected aggression, so it's hard to say what might be causing this without more information. In general, treatment for this issue involves identifying situations that tend to trigger the aggression, then managing the dogs to avoid these situations or working with a trainer to teach them some type of alternative behavior. Medication for one or both dogs may also be helpful, depending on the underlying cause of the aggression. I would recommend talking with your veterinarian about this problem as a starting point - he/she may suggest starting some type of medication if appropriate, and should also be able to refer you to a good trainer or behaviorist in your area who can work with you in person. Make sure that the trainer you work with uses reward-based training methods only - punishment is not recommended in the treatment of aggression issues in dogs, because it often makes things worse. Until you are able to see your vet and/or get a trainer involved to help you in person, the safest bet would be to keep both dogs separated for now to avoid any additional fights.

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