That’s definitely NOT a bedpan, it’s way too shallow. I’ve seen pewter bowls shaped like that for displaying fruit, but in my head canon it’s for Communion wafers.

Here’s a similar one: https://amusespot.com/products/wide-rimmed-bowl-by-match-pewter?variant=37212784522

I mean if they don’t use it for anything else it’s just a funky food bowl for the cats