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Hi - there was a guy on TV with an incontinent cat, part of a documentary- see this YouTube
link YouTube - Dog incontinence, cat incontinence, cat nappies, cat nappy
He bought cat nappies and described them as a "life changing event" - and I know 2 people who have used them, one for a cat urinating / cat incontinence and one for a spraying cat. Guess they are also suitable for cats in season. I know they found them ideal for cat pee & for faecal incontinence, as they were so sick of cat urine with the cat urinating in just about every room in the house.
Hope this is of some help.