A door is what a dog is perpetually on the wrong side of.

"Marriage is the alliance of two people, one of whom never remembers birthdays and the other never forgets them."

"Any kiddie in school can love like a fool,
But hating, my boy, is an art."

The trouble with a kitten is that it eventually becomes a cat.

"Some debts are fun when you are acquiring them, but none are fun when you set about retiring them."