I went to a puppy socialization seminar at my local Petco on Sunday. My 11-week-old GSD and a 7-week-old Great Dane were the only puppies there. The "trainer" suggested that I need a choke collar for my pup because she wanted to play rough with the other puppy-who wasn't interested in playing at all. All I had to do was hang on to the leash and my puppy left the other one alone. The trainer also said that she likes to have 2 dogs in her classes. And that she would be teaching sit and stay for the first 2 weeks. My puppy already knows these. I'm not going back.
Unfortunately, I haven't been able to find any other dog trainers in my area.
Stormageddon (Stormie) GSD 11/9/13
Rio Husky/Shepherd Mix 8/1/00-7/15/13