Jens, our 9 week old schnauzer, is becoming quite a challenge. I didn't have many problems with Heidi, my 10 year old schnauzer, so I didn't think about how hard puppies are. Jens is a chewer, a biter, he steals everything, is a bit stubborn, is not crate or housebreaking well, he terrorizes the cat and the other dog. He will definitely need a little more work than Heidi did. Are there any books or websites to help me? I may take him to classes but they are not a good fit on times (immediately after work and I have a 40 minute commute to get him).