I have rats in a rack, but the two cats are more interested in stealing the lab block so that they can chase it all over the apartment. Apparently lab block is an awesome cat toy. So awesome, that I had to put a cereal box on top of the bottom bin feeder, so Sammy would quit stealing it (plus it hurt to step on it if you didn't see it in the dark).
Lexi is the younger of the two cats (less than a year old), but she's learned the word "NO!" and stops in her tracks. She likes to sit next to me when I clean snakes, and has more fun chasing the paper towel I'm using to rub down the tub (from the outside of the tub, while I'm wiping down the inside) than messing with the snakes.
When she was younger, she did want to "play" with the snakes when I had them out, but a quick "Lexi, NO!" was a good deterent. And Diamond the dog doesn't care a bit about either.