1. Your cat won’t make you stay late and then screw you on overtime
2. Your cat won’t write an intentionally vague but still disparaging employee review
3. Your cat can’t email you documents after work hours
4. Your cat won’t take your ideas, use them as their own and never ever give you credit
5. Your cat won’t get drunk at the Christmas party and try to kiss you
sweet little black kitty 
I dunno- cats might do any of those things if you ask me.