I've grown up around quarter horses and dogs, and we have always had Australian shepards. We raised them from puppy age to adult around the horses and they learned very quickly not to try to herd the horses but it was a process haha! Other than that they've been great whether we're out on a trail, or in the arena for an hour or so. I am a runner also and they've been great for that too. I don't know much about other breeds as we have really have always had aussies (one black lab mixed in there once) but I do know they did well with our horses!