peeing on bed

Hello Everyone I have an 8 month Cavalier, who is very good - she has been house trained for a while now - an occasional accident now and then, but by and large very good. But .. last week she pped on my bed - am not sure if she did it out of excitement or what, but she did. Today, I bathed...

So, I've recently-ish gotten an Italian Greyhound. She's just turned one. A couple of times now she's peed on my dad's bed (while having access outside). If she's allowed, she would sleep on my bed, never anyone else's, and she has never peed on my bed. She's just now peed on my (older) brothers...