My dog is a catahoula. She is about 4 years old, I rescued her 4 months ago. She has been spayed and has had great temperament so far. I have trained her how to sit, heel, lay, etc. she has had no issues around other people. I have friends over to the house all the time and I walk her around the neighborhood with no issues or signs of aggression. I take her to the dog park 2-3 times a week and she plays there normally. She is a bigger dog (61lbs) and can play rough but doesn’t bark or bite at the other dogs.

I brought her to my parents house for spring break and introduced her to my parents dogs. They were all saying hi to one another in the yard and it was doing fine. Until my dads dog jumped up onto me to say hi (she has been doing this for years) and then my dog came over and attacked her. Since that we have tried to introduce them back to one another and we have had zero Luck. My dads dog gets mad when my dog is near him and my dog gets mad when his dog is near me. Any advice on how to help the situation?

P.s. both dogs are the same size 60-65 lbs