A lot of cat experts in here seem to have missed the fact that there are plenty of vegan animal foods available all over. Personally I think making it a requirement of an animal someone is giving up is ludicrous but the food does exist.
Example 1: Wysong Vegan Feline/Canine Formula Dry Dog/Cat Food - 5 Pound Bag https://www.amazon.com/dp/B00F3JSB18/ref=cm_sw_r_awdo_9VEK5F556N1CG755BAVX
Example 2: Evolution Diet Vegan Maximum Life Dry Cat Food, Non-GMO, Grain-Gluten Free, High Protein Kibble from Peas and Sunflower Seeds https://www.amazon.com/dp/B07QH3HMRP/ref=cm_sw_r_awdo_5P83147BQNJF0YAAG9X0
Buy this instead: https://www.amazon.com/Wysong-Vegan-Feline-Canine-Formula/dp/B00F3JSB18