Stalk, Scratch & Sleep the Purrz Way. Designed by veterinarian Dr. Duncan Houston, Purrz's most-loved toys, scratchers, cat trees, and beds are built around your cat's natural instincts and made to look good in your home. As an emergency vet, Dr. Duncan Houston saw too many preventable cases involving cats swallowing unsafe toy parts, leading him to build his own products that he could confidently recommend. Purrz is built around what cats need—if your cat isn't resting, they should be playing with purpose by stalking, chasing, and scratching to engage their natural instincts. Every product must pass the test of his own cat, Gary; if Gary ignores it, it doesn't make the cut.