That sucks, my dog died years ago on halloween. I let her out and I guess she just lied down on the grass and died and my dad noticed she wasnt moving at all when I was gone so he called my uncle up and buried her in my backyard before I got home. So I didnt really experience the whole shock that she died but it still sucked.
I guess if I had a cat and it died I wouldnt feel that bad compared to a dog and cats are usually more independent when their older plus it would only take a few minutes to bury a cat.