Time to start taking advantage of your cats good credit and do a Cat-o-rama.
Just took a look at a couple of my accounts online and see that Amex appears to require a SSN for an authorized user, but Chase does not.
I'll have to start watching the bonus points for AUs offers - with two dogs and a cat they could clean up. I am afraid my German Shepherd might take it to far though - she already watches too much TV. No telling what she will buy if she turns on the home shopping network while I'm not home.