I have been doing trick training with Gypsy my 2yo B&G for a while now and she is doing great. I am sure she enjoys the time and the fun. I use mainly sunflower seeds for treats and occasionally add in little pieces of walnut (her absolute favourite food). Just lately when I go to reward her after a trick she has started nipping me. She is not striking and not biting but giving me a hard deliberate pinch instead of taking the treat . And sometimes she squeals as she does it. I have tried to figure this out, but the only thing I can think of is she is cross at not getting walnut all the time. So, if that is the case what should I do? Should I stop treating with walnut all together? Any advice would be very welcome, thanks!!