They are hard to walk, they pull. I am unable to walk them, due to my bad knees. Brick can seem a little aggressive with other dogs when they come near the yard or when he’s on a leash. But I think he’s just insecure because he’s gotten loose and has had no problems with other dogs that he encountered. He also seems to be aggressive towards his brother when other dogs come near the yard, but he is just in protective mode and wouldn’t hurt him. Brick is the black colored dog. Unfortunately, my dogs are also runners, If they have the chance and they get loose we will have to chase them down. They are mainly house dogs and they mostly just go out to go potty.