Karri Garrison is getting rid of that cliche about dirty rats one rodent at a time. Grooming isn't just for dogs anymore, and many pet owners are bringing in their rats to groomers like Garrison, who uses waterless shampoo to make their coats shine and smell sweet.

Customers at Katie's Pet Depot in La Verne, about 30 miles east of Los Angeles, began requesting rat grooming soon after the store opened nearly two years ago. Employees began researching rats and even adopted some.