Introducing another character from Petra's world. This is Roxy the doberman. She works at the same place as Petra and is an absolute piece of crap. She's a mean spirited bully and all around pain to be around. She basically serves as an antagonist for Petra's stories.
Since Roxy is such a piece of garbage person, she often earns punishments for her behavior. So, it's not uncommon to see her sporting some crinkly underpants undernieth her maid uniform. Or, sometimes in place of her maid uniform. Depends on how she's been behaving.