Okay, maybe Arm & Hammer has a stake in this, since the company does manufacture multi-strength cat litter. But the vets insist that cats aren't as independent and solitary as we think; instead, they are happier when there is another feline in the house, reports Wireless Flash.

The Cat-Panion survey showed that cats left alone in the house experience feelings of loneliness, anxiety, and depression. In addition, their brains are up to 25 percent smaller and they are more likely to exhibit behavior problems than cats who have a feline companion. In Switzerland , there is an anti-cruelty law that forces cat owners to buy cats in pairs or more.