10. Do unto others whatever the hell you want to.

9. The world is your litter box.

8. Always put off until tomorrow anything that interferes with a nap.

7. Look before you lick.

6. Pride goeth before ... you've got to be friggin' kidding me!

5. You scratch my back.

4. Strike while the feet are bare.

3. When in doubt, wash.

2. If at first you don't succeed, act like you intended to fail.

And the #1 Cat Proverb:
1. The way to your owner's heart is through their ankles when they least expect it.