A cat immersed in milk will displace her own volume, minus the amount of milk consumed. A cat's interest level will vary in inverse proportion to the amount of effort a human expends in trying to interest him. Any pill given to a cat has the potential energy to reach escape velocity. It Doesn't Matter. Cats rub your leg when they want affection, not when they're horny.
Cats use a litter box.
Dogs use your leg. In 1996, over 10,000 US deaths were attributed to a dog owner's choking on saliva during morning wake-up licks. Cats always land on their feet. Dogs just won't let you throw them. Cats let you kick them when you're stressed out.