Thanks for the suggestions, guys!
I ended up going with Action Jackson for the tagline, and my phone number along with a skull symbol on the other side. I can't wait to see how it turns out!
I decided against the treat thing because I had already ordered a tag from Poochy Couture (on etsy) that says Treat Junkie on it. Sooo, I figured I'd be different.
My grandma is buying this tag as one of "my" Christmas presents for her grand-dog, LOL.