when we camp with our cats, often we will put a set of wheels on top of the front bows (a real pain w/ a spin bridal) and take the wheels to the islands with us. This allows us to pull our cats up on a beach overnight. They are a huge pita and i would never sail with them except for this reason. the windage is extremely noticeable, the weight effects the coe, and they look terrible.

If i needed to take them more than a few miles, i would probably try Hobie Gary's method (a few pvc tubes with boat fenders on them)