We've sailed for thirty years with cats
If there is a problem having cats on board, we've met it head on with a number of cats over the years. One got loose from her harness and climbed a tree and stayed there for two days, another got stung by a bee and almost died and one jumped from the dinghy and swam to the mother boat and climbed the stern ladder and was steaking for the sleeping bags by the time I caught him. He was the only one that didn't like boats and ironically his name was "Skipper". There has been a lot of good advice given already in these responses so if I repeat some, forgive me. The suggestion of what type of kitty litter is a good one but what ever you do, bring enough. We have a long story about running out of kitty litter in Desolation Sound. Our kitty box normally stays up in the forepeak cabin but finding a spot where it doesn't move much is the best thing.Yes, cats do get seasick. When you watch one starting to lick it's mouth, you're about to have a problem. For those cats that do get seasick, we carry some cloth covered plastic small blankets and then we have old towels to place under the cat.. If they do get sick, it is easy to clean up. Holding the cat sometimes helps. One of our cats always got seasick and then one season, she just didn't do it anymore. We have no idea why she quit. Normally, they get over it in a day or so.One of the best things to buy for your cats is the Sherpa Bags for animals. They are soft sided and fit in a bunk and you can carry your cats from the car to the boat and anywheres else for that matter. Our cats know which bag is whoes and they see it as their space. So when things for bad, that is where they tend to go.Our cats also have to wear a Walking Jacket (www. metpet.com) when top side or at the docks. One likes her jacket and the other hates it but goes along with it on. None of our cats have fallen overboard while underway but if they did the jacket would be easier to hold. By the way, we found this jacket after one of our cats got out of a harness.One thing many people don't think about is the cat first aid kit. Talk to your vet about what should be in it. We have seringes to administer medications, hair brush, eye wash, etc. I don't want to spacifically name stuff--your vet can do that.We also bring a scratching post or pad and a bunch of toys. We didn't realize that they miss their things as much as we do, so we have a cat bag to take to the boat. We also carry a salmon net (fits on the boat hook) just in case they hit the water but we've never had that problem. Since we use an Avon inflatable, they have little problem getting from the dink to the mother ship but we use to have a Hunter 40 with a stern that was awsome even to adults. Several of our cats slipped going up the rungs but since we were there we normally caught them before they got very wet.One time we were rowing around in our inflatable in very shallow water. My wife and I were looking over the side at little fish, some crab and whatever. The water was extremely clear. We had Lanki, our Siamese with us, and she wa watching as well. All of a sudden, she just walked off the dinghy. We were as surprised as she was and she climbed back on board on the oar. We took her back to the main ship to dry her off--so take extra towels with you.Our cats like Sidney, B.C as one of their favorite stops. There are a family of Swans there and our cats have never seen such big birds up close. It's like going to heaven for a cat. It's a wonderful place for adults as well.There is a neat book on the market entitled, "The Cat that Went to Paris." It will give you some ideas of what to expect. Like us, they like quiet anchorages the best. They sit on the dodger top and enjoy the sun and watch the birds. Good luck with your cats,Les