Thankfully, he has the most awesome tail in the world and butt tufts that look like pantaloons, so he doesn't need these.
But (ha!), if your dog/cat does, here's the product for you!
Is your pet feeling left in the dirt because of his/her unsightly rear? I’ve got them covered... Rear Gear is handmade in Portland, OR and offers a cheerful solution to be-rid your favorite pet’s un-manicured back side. Rear Gear comes in many designs including a disco ball, air freshener, heart, flower, biohazard, smiley face, number one ribbon, cupcake, sheriff's badge, dice, and you can even make yours custom, so there’s a Rear Gear for everyone.
So, if you find yourself in need, check out this cute girl's site at: http://www.etsy.com/shop/RearGear