i keep my 2 fell terriers together, a dog and a bitch, tried to split them but they are devoted to each other and go off their food, the bitch is boss and the dog accepts that. i know im taking a risk by keeping them together, i work them seperately, i feed them seperately, they have a 1/4 of an acre dog run. and 2 kennels in it. they spent all their time together like a little old couple.