your question wasn't that hard to understand, you were just unforetunate to be answered by the lets make a pratt of the new boy syndrome ,get 10 useless posts and you will become a regular,that then will give you the superiority to then hunt down new users and make there initiation into the forum similar to yours .
biggest danger with cats is pitchpoleing when running , more than capsizing on the beam .stick with the forum its very good most of the time. hopefully some one with a greater knowledge of cats will have answered your post by then
I am assuming you mean a cat with fur, teeth and claws.
We sailed half way around GB with a rather unwilling cat.
Main problem was getting her to wear the life jacket - she hated it. It took 2 people, 1 with good solid gloves to restrain the cat the second to attach the jacket.
The Jacket has a "handle" on the back to which we tied a length of light twine as a safety line. This allowed her to wander about without danger of loss. We did have a net as a back-up retrieval system.
Only real drama was in Port Ellen one night when we came back on board to find the cat missing. General panic and a minor fracas with SWMBO who wanted to sail around searching (the cat is jet black). Eventually she turned up asleep in the cockpit locker.
Only other tip is watch your upholstery cats take out any grudge they have on your furniture.
The question is not at all clear. There is a difference between being a newbie and asking newbie questions, and not having the common sense to formulate the question clearly. I don't believe the responses were intended to 'make a pratt of the new boy', but if they were he certainly deserved them.