Chihuahua is a pint-sized peril to its owner's roommate; slobbering Great Dane afraid of shiny floors.

A charmer around people, Opie becomes aggressive around other dogs; Flirt the Chinese Crested is hyper and neurotic.

A vizsla with a biting problem is afraid of everything; a Shetland sheepdog barks at household appliances.

Josh, a Maltese-poodle mix, won't let anyone go near him with a brush; Boomer, a clownish dog, must always be the center of attention.

Harry goes crazy at anything on wheels; shadows drive Brooks crazy.

Cesar tries to help a boxer named Coach before he is put down for biting someone; Sueki turns her nose up at leads.