Some dogs like to fetch sticks. Others just want to cut out the middleman and find the stick themselves. It takes this pooch a few tries to actually pull down a branch, but he appears quite proud to be bringing his human friends a freshly chomped stick.
You probably shouldn't rely on dogs for tree trimming, but if you're looking for a companion of your own and are ready for the responsibility, take a look at the ASPCA adoption site or Petfinder.com.