Cats are great pets! I would say the most important and vegan freindly things to do with a cat, is to insure you get them fixed! I think all vegans have diffrent opinions about how to feed pets, but as for what vets say and the reality cats are obligate carnivores. You cat needs some kind of meat in/ with the meals, its what healthy for them! With that being said among other things, look into some of the grain free options (big health issues with grain in thier diets otherwise) and buy bulk if possible! If you are able to locate a vegan dry/wet food, I would still suggest buying some kind of meat, sadly, to give with their meals or as a treat.
Cats are designed to eat meat they know no better and need it to live this is the complete opposite to humans who have herbivore teeth know so much better and do not need it to live
Don’t deprive the cat because of being vegan if he/she really likes meat and needs it but try and buy from as cruelty free as you can find companies
Anything you do makes a difference and we’re all behind you ❤️