I have a 2 year old boxer that was introduced to a mix breed possibly part boxer male dog. the other dog belongs to my roommate and we are trying to move his dog in too. his dog is neutered but very aggressive around my dog. my dog is passive and runs when the other dog snaps at him. we have not been able to take the new dog off a leash because he is constantly lunging at my dog. we assumed it was our presence so we attached him to a pole in the middle of the yard and went inside to watch and hope they would calm down. The other dog bit me on the feet and on my wrist when my dog approached (thank god for steal toes lol) when no other dog is around the new dog is playful and will come up to anyone to be pet. What would be a good way to reduce the anger of the aggressive dog.