Does anyone have an opinion on one-on-one trainers? Sam has been to puppy pre-school and has done very well. He sits, lies down; sometimes he even comes when called, walks on a loose leash and stays/waits. I figure at 11 weeks (nearly 12), he's doing pretty well. Having said this, when there are distractions, everything just turns pear shaped! Consequently, I'm considering getting him a few sessions with a personal dog trainer. When he's older, I also want to put him through at least one obedience class. Does anyone work with one? If so, do you find this useful?