I took Harley out for a walk the other day, and ran into a friend of ours with her Airdale Terrier (Jazz). Now, I know that boxers are hyper, Jake was too, but Harley went NUTS! He was litteraly bouncing all fours right off the sidewalk into the air (Jake would jump up with his front paws in the air, but never did this...). He actually almost landed square on Jazz's back once! He wouldn't stop, I had a hard time keeping him on the ground. It's so easy to forget how hyper they are as puppies after you've had an older, mellow one for a few years.. It's funny because Harley is so hyper in certain situations, but people are telling us that he mellows out in the house faster than Jake did, when they come for a visit.