How do dogs know how to do that, anyway? Does the Oriental rug give off an "I'm Not Machine Washable" odor? I had easily washable hardwood floors everywhere in my house, and where would my dog drag the chicken bones from the garbage to chew on and puke up? That's right. The middle of the oriental rug. And what a glorious mess it was for him to roll in! I may puke from just the memory of it now, six months and a new place later. Yes, it was so bad, I had to move. :)
Pets and other dead stuff