Originally posted by Cataholic
IMO, you are asking too much of nature for a positive outcome, with probable deadly results. I wouldn't do it.
There are many, many people that keep both rats and cats sucessfully. My cats get along great with my rats, play together, eat together, sleep together etc. They were raised with small animals since they were kittens, which is the way to start. Take them out for about 15 minutes each day, letting them sniff eachother. Please do be careful of not underestimating the rat, as they will attack the cat and can injure the cat. If the kittens start to play too rough simply take them away. Eventually they will get used to eachother and the cat will learn his bounderies. If the rat is being played with too rought they usually let the cat know by nipping etc. Rats will defend themselves ferociously.

If you notice the rats acting scared do not force them to interact because this will just make things worse. Some rats are just naturally scared of larger animals, and well, some cats are scared of rats. Go figure. Here are a few photos of my rats and cats and other animals together. The key is to make sure you are always there when the two are interacting together.










I have more on disks somewhere.