What is your dog's favorite agility obstacle to perform? For Milo i'd definately say either the tunnel or contacts. He has, on occasion, after we finish, ran back to the tunnel to do it again. He also really likes the A-Frame, Dog-Walk, and Teeter. He would always choose to walk on the curb or any sort of ledge to balance when he was a puppy, so i think that was a very natural behavior for him.