I think when God realized how worthless the cat he had made was, he decided to make them soft, cuddly and cute and gave them the ability to make the most wonderful sound in the world, the purr, so that we would love them and take care of them.
And in the wild, and even at home, cats have a natural tendency to attempt to clean up after they pee or poop by burying their deposits under soil when available, while dogs don't.
BTW, if you wanted to compare the two fairly, you could have used a much cuter dog (maybe a poodle) than a pit bull. No comparison in aesthetics between the two animals you show. By using a pit bull, you play into the stereotype of Republicans as "mean spirited."