The Dog Crawl Through is a fun tunnel activity, similar to the kind that kids enjoy on playgrounds, which dogs will love darting through. This is an easy agility training obstacle which is a great first step to attempt before teaching dogs to perform more complicated activities like Hoop Jumps. Since dogs run on all fours, they don’t even have to duck to slip through the tube, making it a very natural activity for them. It even doubles as a convenient shady enclosure where they can escape from the sun on hot days. The tunnel las a diameter of 30 inches, making it easily wide enough to fit almost any breed of dog. It is made from high density molded plastic, which is tough enough to withstand nearly any outdoor weather without showing any signs of damage, yet still soft enough to be comfortable for dogs’ paws.