Isn’t animus a dog? So it should be anime dog/wolf girl rather than cat girl?

Yes, Anubis is a dog-headed or jackal-headed god. I actually can't find anywhere on the Anubis website where they talk about their mascot; they just refer to her neutrally as the "default branding".

Since dog girls and cat girls in anime can look rather similar (both being mostly human + ears/tail), and the project doesn't address the point outright, we can probably forgive Tavis for assuming catgirl.