My daughter's yorkshire terriors had some occasinal scraps, sometimes at feeding time. They have lived in relative harmony with a female sibling for at least 10 years. After their sister passed away, only 2 males were left. The older yorky had always been dominant. Suddenly, w/o warning the began to fight viciously. Many fights drew blood and would have been to the death, if not stopped. My daughter takes her dogs to the vet continuously so medical reasons have been ruled out. She is trying to get an app't with a behavioalist. They have to be separated carefully and watched so they don't make contact. Does anyone have ideas or a similar experience. Gates and leashes are all over the house and it is getting stressful. My daughter loves her dogs as we all do. I know I'm new to the community and have searched to find a site with caring, dog loving people to connect with.
jmt