Izzy just finished clicker training for puppies and now we are going to puppy II class in two weeks. I was using the Natural Balance logs cut into slices and then cut those slices into tiny, tiny pieces and that worked and Izzy didn't gain anything. But now I found Yorkie Yummies from Chattiesmom and those are even smaller and I'm going to use those for our next class session.
I was also told my our trainer not to feed Izzy dinner the night of class since the reward treats would be her dinner. I also did that on the days we practices our sessions.
I also used Cheerios and frozen peas and that works too but only use those treats when I'm training at home.
Good luck on the training.