There are a bunch of submissions and I wanted to give feedback to everyone, so I'm going to list some strengths and weaknesses that I perceive from the GDD's in this challenge (take with a grain of salt, I recognize the challenge this jam theme + time limitations, especially during a holiday weekend).
Strengths: A fun, easy to understand concept. All audiences will understand this sort of stereotypical dynamic between cat and dog. I like all the detail you've added about things that would distract one animal versus another. "A long-term but not monogamous relationship with catnip." Beautiful.
Weaknesses: I would like to see more fleshing out of the technical aspect of mechanics and systems. It seems like you've got this wonderful concept, but you might benefit from discussions about ways to make it work in engine. If I were to nitpick, you could eventually add more elements such as concept art or an audio guide to help other people working on the project as well. I would consider prototyping a single level (interpret this as you will, it could be any sort of prototype) to better convey the moment-to-moment gameplay. It's obvious there is tension between the two animals, but I also get the feeling like the level environments would also contain hazards/sources of conflict. I know the GDD isn't finished, so please consider these as suggestions as you move forward rather than criticisms. You've done a lovely job and the game seems like a lot of fun!