My gosh, any microwaving would cook the poor cat's organs. A very horrible gruesome way to die. Microwaves heat by causing the molecules of matter to sort of rub together, just like rubbing your hands together produces heat. Wouldn't matter if it's set on low, high, or whatever. The cat's organs would cook like any other protein.
Yeah, that’s awful. Treat it like a frozen turkey: thaw in cold water in the sink for a day, then 3 to 4 hours at 350 degrees. Basting optional, but recommended.