Just crunched some numbers for my personal finances. Apparently, it costs 1400 dollars / 1230 euros per year to own my cat. That includes cat food, cat litter, cat toys and vet bills, but not cat furniture. I haven't needed to replace any of the furniture yet, so I don't know what the annual cost for that is yet.
I think he's my single biggest expense outside of my debts, and all he does is poop, moult and eat. 😅