My cat fena was put down a few months ago ans I still don't know what was wrong with her. She was losing weight, had diarrehea and was vomiting. Then she became pregantn and had kittens. The kittens ended up having it and then toher cats around our house got it. So whatever she had was contagious. The vet said it could be internal worms and i got her medicine for that and it didnt help. What was the problem.