I usually start my pups at the bronze class about 12-14wks and they love it but i do it for socialisation more than anything else. OTher breeds and people.
Every pup i keep goes through it now...

we taught kala food refusal from an early age she wont take treats from anyone apart from family and friends but she will still look at me for the nod that its ok. she backs away if anyone else tries to give her anything our vets have to give me the treat to give her when we go there.

My dogs wont accept treats from other folks but i didnt teach them it they have just always been like that... weird really...

3 of mine won't take treats either but Misty will take them from anyone and everyone

Thanks guys, always nice to get others opinions, just in from a fabulous puppy class and a new combined Clicker Rehab Class for dogs with aggression problems. All went well and it was lovely to see sensible owners develope good handling skills despite their dogs having problems and also having a bit of fun with their dogs.

Seems like many view pup classes as a socialisation experience? Of course I am guessing most of you have other dogs or have had dogs before so the actual obedience training you already know.