We have had our cat for over a year and she has been perfectly potty trained from day one, but all of a sudden she has had diarreah. It is getting stuck in her tail and this morning I found a puddle of pee on the floor. She hasn't had any new food or done anything out of the ordinary. What could it be?

She is probobly kind of ill by eating something unappropriate outside the house. You could give her a nice warm home cooked meal to perhaps make the cat feel better. It might work.

Take a fecal sample to your veterinarian, it could be many different things

Take the entire cat to the vet! Sudden diarrhea with unusual peeing could be a sign of illness.

Definitely take the cat to the vet-how old is she? Is she spayed? Does she receive monthly deworming and flea treatments? Do you have live plants in the house? Etc, etc. Too many things possible to figure out on your own! Diarrhea usually does not clear up on its own so make an appointment and be sure to take in fresh fecal sample so they don't have to go in and get it-ouch!