I hate to do this but I have to rehome my 4 almost 5 year old St. Bernard (hes about 180lbs). Hes a very good dog just wont get

along with other dogs it started about a year ago and we have tried everything to fix it but nothing has worked and we have 2 other dogs (we have had for 2 and 3 years). Before people ask its all dogs not just the ones in the house. We really hate to do this but we are out of options. He needs to go to a home were hes the only dog.