Anybody know of a good dog trainer? I have a 6 month old Great Dane who just is not getting the potty training idea here. He will pee in his crate. I'll take him potty many times and as soon as we come back in he goes pee and poop in my apartment. And becoming a barker. He jumps on people really bad. He's a very sweet natured dog. The potty training thing is killing me. Help