Very good point. My cats get wet only. The male I mentioned in my other comment is underweight since he never regained his full appetite after his urinary issue

Very good point. My cats get wet only. The male I mentioned in my other comment is underweight since he never regained his full appetite after his urinary issues, so at some point I started allowing him to snack on a bit of dry food at night to get his weight up. A month or two later he developed urinary problems. This ended up being caused by crystals in his bladder, which are associated with not taking in enough liquids. Now, I'd rather he be a little skinny than risk that again. Water fountains help, but aren't enough. There is an issue of Royal Canin Veterinary Focus that focuses on lower urinary tract disease in cats and dogs: https://vetfocus.royalcanin.com/en/-/media/vet-focus/en-us-pdfs/veterinary-focus--2014--241en.pdf?rev=101a0a39bd864a05858567eec241e174 https://vetfocus.royalcanin.com/en/-/media/vet-focus/en-us-p... There are interesting sections on Feline Idiopathic Cystitis and blockage, which talk about water management as well. On page 23, there is a table called "Table 1. Clinical features of cats diagnosed with cystitis with (n = 8,220) or without (7,862) concurrent pyuria in 2012." At the bottom of the table are a few rows on diet. ~3.5% of cats in the sample were on a canned-only diet. ~19.2% were on a mix of dry and canned food. 77.3% were on a dry-only diet (percentages slightly varied for those with pyuria).