I have a 8-1/2 old month black lab also. He has recently discovered he has the ability to counter surf. I've done a pretty good job training Chopper with "Leave it" and "Down". Therefore, he gets a stern correction every time I have witnessed this happening. He is testing his boundaries. This age for puppies is their time to rebel against previous training. You have to remain diligent with training. Make sure your pup knows this type of behavior is not acceptable. Reinforcement will be required. Keep all treats and food off the counter if you are not cooking or eating. If there is nothing on the countertop for him to steal, then he will lose interest. Puppy proof the place.