In contrast, Cupcake is a 12-pound Chihuahua/Jack Russell mix. She cannot crush a bone, but she can unravel a rope toy in 45 seconds. She uses her incisors like scalpels.

Every legend has a humble beginning. Cupcake and Mr. Biggs started not in a laboratory, but in a cramped apartment living room. Their owner, a product reviewer named Jenna K., was tired of expensive “indestructible” toys falling apart in under ten minutes.