Resolve has a Pet Oxi Advanced with Odor Stop that is made for carpet stains when pet urinate on them. I use it all the time for my dog who just hasn't gotten the idea that my green carpet is not grass!
The back of the product states that is it is safe to use on wool nylon or other synthetic carpets. I have sprayed it on some material that she got into and it and then I washed it. It worked!
Worth a try.