Don't take anything for granite. That's what tombstones are made of.
I've never been convinced that the sun would come up without me barking.
When time marches on, it steps on your nose and tail, and leaves boot prints down your back.
If you like Hank, you'll like Wilder Good, too.
When you find a germ of truth, beware. Those germs can make you sick.
Bravery and devotion to duty hath no greater reward than to see the cat get into trouble.