I recently changed the dry food the kids eat to science diet.. somehow, meow meow seems to be getting diahorrea(sp?) from it but i've checked with the pet store..they say it takes a few days for her tummy to get adjusted to it.. last night when i was changing her cat litter, i realised there's blood in her poop.. somewhat like our periods but she's sterilized... i'm wondering if she is sick... any advice or anything?