My 6 month old Borador (Border Collie X Lab) is responding reasonably well to training. When I am training I use the reward system however, I have found recently that my dog is biting (playfully) at my hand and I feel that this is because of the reward training. He knows that I keep food in my hand, so he looks for it. How can I stop this when I am not training. I find that he responds well to the reward system. It is during the normal day to day activities that he has begun snapping at my hand. I am not having any luck at present stopping him from jumping on people, can you recommend anything? Also at what age can I introduce another puppy or older dog as a companion for him.

thanks Annette