The bad thing about treats is they always seem to be just out of my reach! Usually I just try to gently raise my paw, and lots of times that works to bring the hand to my mouth.
And if I really can't reach, I can stand on my hind legs like a dancing bear to get the treats.
Once the hand gets in my mouth, I have learned to hold on tightly so it doesn't disappear. Sometimes I must use my teeth. But only in an emergency.