I hadn’t really thought about pets as having a gender before now. In the design process I’m rarely thinking “this pet needs to be a boy” or “this pet needs to be more feminine” I usually just take pen to paper with an element in mind and see what happens. So a lot of pets have turned out looking gender neutral, and a few masculine (I’m looking at you Geo).
But few look specifically female, which was an influence on creating the third Earth monster. Here is an early render of how she might look in the final version.