Can anyone recommend some good toys for a very busy, easily bored puppy? He's almost 14 weeks now and he's exhausting. I walk him twice a day, he has a doggy door to go out back when he needs to (fully fenced,) we go to dog parks to play and play with him often throughout the day but he still seems ADHD and gets bored quickly. I've had other lab puppies before but this one is by far my most challenging. HELP!!