Sad to say, this if a common occurrence when you adopt two males from the same litter. Either they grow up to be totally dependent on each other and can never be separated, OR they are in constant contention. How old are they? Have they been neutered? If they are over 6 months old they need to be neutered. This will help reduce the aggression.
However, it is not the cure. You need to find a behaviorist NOW! Don’t just pick any dog trainer – look for one that can come to your home and work with you there. Or one that specializes in aggression cases such as this. And sad to say – the only answer may be that you have to find one of the boys a new home. They may have developed such a dislike of each other that they will never live comfortably together.
You do desperately need help! But it is far beyond the scope of this forum. You need hands on help from a professional that can see your dogs and figure out what triggers the aggression. And in the future – remember – never get 2 puppies at one time!
when you work on training, is she in the harness? describe your usual training routine with all tools.
When we begin our training, she sits and let’s me put her harness on her. We then work on whatever we need to work on (right now she’s doing stay and come). We use positive reinforcement and treats. We usually move into the backyard before the end of each training session. But as soon as we’re done training, she goes insane. She’ll start running in circles and going back and forth across the yarf before settling down and letting me take her harness off. And while she’s doing this, she will not listen to me when I tell her to calm down or sit. Other than that, she does really good with it, and she’s a really fast learner and has the sweetest temperament, so I would hate to have to pick a different dog for his service dog. But I also know that if she keeps doing this, I’ll have to.
How old is she?
Was she selected for SD work by the breeder?
She is only 5 months old. I picked her myself along with my friend (the one who’s father is getting the service dog) according to some small tests (retrieving, recovery from being startled, following, etc.). She’s actually from a rescue however, but I spoke to her foster who told us that she personally thought she would do good work. She aced all of our tests as well.
sounds like she’s being a puppy. 😉