Short but sweet post, but I think I nailed it:
After having both a dog and a cat, I have come to this conclusion:
Dogs, no matter how old, come to you as children. You teach them, you mold them, you let them know what your expectations are and you train them to behave as good citizens. Dogs want to please you; they’ll quickly adhere to your rules if you’re consistent and firm.
Cats, no matter what age, come to you as a crotchety old-timer with a cane and an attitude, screaming for everyone to get off their lawn, and you suck it up and deal with it. Because, CAT.
No freaking lie.