Cats on Board
All I am reading about is cats getting sick. There are other sides to owning cats aboard.
Best to get them declawed if living around the boat. Otherwise they may exercise claws on your (or others) canvas and bimini tops. I''ve got a bimini with dozens of 2" long scratch holes in it now and a previous 35'' sailboat mainsail and cover clawed. Both times from cats off other boats. Don''t expect skippers to be friendly to your cat if they are causing damage.
One boat I know had a cat that kept spraying their pillows. Another boat leashed their cat to the deck so it wouldn''t jump ship. That cat stranged himself after wrapping the line around a lifeline trying to jump off the boat.