When you do speak with them again (see, I KNOW youa re going to, this is really becoming a mission for ya! and that is a GOOD thing!), maybe remind them the cat can NOT have the fleas treatment they use on the dog; and maybe also that fleas can cause a cat to become anemic and die. I know this is true for kittens, I imagine for a senior kitty this could also happen.

You are thinking this through, making sure you aren't too "nosy," good job, Carole!