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Hi there, Welcome to the forums, I think he is unsure of what he has do so he may be "trying" some behaviors, or it's just that, as a puppy, he just wants to bite/mouth anything presenting in front of him. To remedy this, you can try several options: 1) Make sure you keep your hand very flat, so there's less chance for gripping anything. I can see though a big puppy still trying to mouth the whole hand, so another option is... 2) Be very quick to click/verbally mark and reward. If your dog has a long nose, there will be chances his nose will hit the palm of your hand a split second before he gets to mouth. So mark as fast as you can and toss a treat/kibble to the ground. With several reps, he should understand the goal of the exercise is just a light touch and then go to get the treat/kibble. It could be he's just trying to mouth because you have fed him treats by hand in the past and he's trying the easy way, but with several reps he may get it that he must nose touch your hand first in order to get the treat. 3) Encourage sniffing. You can try to hold some stinky treats in your hand before asking the hand target and see whether that may encourage sniffing. The moment he sniffs your hand, click/verbally mark and reward. 4) Try when he's a little more tired (but not to the point of being cranky) and less mouthy. 5) Try feeding a crunchy treat just prior so that he's mouth is occupied and offer your hand as a target while he's still chewing. He might not think of mouthing because his mouth is already busy, so you may get a nose target instead. Let me know how it goes. Best, Adrienne