I have a 10 month old border collie, Riley who is extremely intelligent and can pick tricks/training up no problem at all! But she is very protective of myself and my boyfriend. When people she doesn't know come to the house, she is very protective and will bark non stop, we've been trying to counter condition her by moving her enough away to still see the visitors yet enough space she is comfortable to take treats which we continuously feed so she will associate treats with new people. But...she has a doggy friend Lucy (my boyfriends parents dog) that she goes to visit and has spent overnights with and gets along very well with her, however...if my boyfriend or i are within sight she instinctivly tries to "break" up Lucy from coming in contact with us. At a puppy class we attended they said that this is a "breaking up" technique that alot of dogs will do but especially border collies, in a way to "keep the peace" , if other dogs arent too close together they wont fight, likewise if Lucy isnt too close to us, she wont start a fight with us. Her hair on her back will stand up and she gets very vocal to keep Lucy away, but not to the point where she would bite Lucy. As soon as we're out of sight the barking almost instantly stops and the playing begins, she also is ok if other people are around the other dog, just not myself and my boyfriend. We've tried counter conditioning her with treats around Lucy, to get a positive association, but it is almost impossible because anytime she is too focused or on gaurd she refuses to take a treat..... Any help at all would be excellent!!!! Hayley & Riley The picture is deceiving lol We dog-sat Lucy for a week and they were so tired out that evening from playing outside Riley didnt care Lucy was hanging out in the living room with us!!