In the United States, cats are more popular than dogs yet they receive less than half the veterinary care provided to their canine counterparts.

Dr. Jacqueline Neilson highlights research on cats' litter and litter box preferences.

Diagnosing food-related aggression in dogs is fairly straightforward--the history reveals that a dog in possession or proximity of a food item directs a threat or harmful action toward another with the intent of backing that individual away from the food item.

Cat owners can have a lot of questions: "Should I get a second cat as a playmate?" "How can I stop my cat from scratching the furniture?" "Why doesn't he use the litter box?" So in the spirit of David Letterman, I compiled this top 10 list of cat behavior tips.