Stacey has a short-eared owl named Georgia. Georgia is halfway a mail owl and halfway a pet because she does give into the owl's whims, even when she thinks they're silly.
Sylvie I don't think she has a pet at this point. She had a kitty named Michèle (using pictures of my aunts' kitty) for a while there in magic_life, and I meant to mort her over for m_w but it didn't work out. I should really bring her back, but...Sylvie never has any money to care for an animal.
Marietta again just has a family owl, but this one really is like a pet. His name is Fledge, which cane as a play off their last name and the fact that they've had him since he was a fledgling and he gets a lot of work with the amount of mail Mare and her mummy send to each other.