person A: My dog decided to pee on my bed when I wasn't home. Little jerk.
person B: Oh no!  And that is hard to get out!  Do you have a waterproof cover on the bed by any chance?
person A: Nope. I only discovered it when I tried to lay down on it too. So gross.
person B: oh YUCK!  Well_comma_ I'd suggest a waterproof mattress cover just in case it happens again.  At least if it does happen again_comma_ it won't get into the mattress and you can wash the rest of the bed clothes.  I'm so sorry you discovered it that way!