I'm picking up a cat in a couple days. I'll go shopping with him the same day. Am I missing anything?

Unscented clumping litter is the way to go. If you clean it at least daily you won’t have an issue with cat pee smell. It’s when you get lazy that it smells. But the scented stuff will drive you and your cat bonkers. Ever sat next to someone who was using a scented pad and you could smell it? It’s just like that.

And yeah like everyone else mentioned, get the stuff beforehand. Talk to the shelter about what kind of food they are currently feeding the cat. It will like be science diet or royal canin, you will probably want to keep them on that for the dry food. Wet food which is also super important, you can have more fun with and try all sorts.

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