Why is my dog's behavior suddenly aggressive towards other dogs?

Question

My dog has started pinning other dogs and harassing them. She seems to be picking on dogs her size and smaller, both female and male but not every dog we meet and know. She’s not listening to me at all and even chasing after them once their out of sight. I’ve tried putting her in a ‘time out’ and refocusing her with some basic commands but I’m now having to keep her on the lead and avoid other dogs as I don’t want things to turn nasty. What could be the cause of this behavioural change? Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 1 year old | 38.801 lbs

Ricardo Fernandez, DVM · Accepted Answer

Thanks for using Petco Pet Education Center, formerly Petcoach! This is just likely a display of dominant behavior. These types of behavior can improve though this does require in person training with the help of a qualified dog trainer. I would encourage you to contact a dog trainer that can work with you and Tova in person to really take care of this behavior. The sooner these behaviors are dealt with, the more likely it is that you can improve and resolve them. Good luck and have a great day!

Why is my dog's behavior suddenly aggressive towards other dogs?

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