Cooper is a good sailor!
My wife and I cruised our H-26 in the Canadian Gulf Islands for 3 weeks last fall with Cooper, our Bichon Frise, aboard. Hair was not a problem, as he does not shed. We trained him to potty on a grated containment tray known as a "UGODOG", and this worked fine. After the first couple of days, Cooper really got the idea, and we never had to dinghy ashore for potty breaks. The tray is carried at the rear of the cockpit under the tiller, where it fits perfectly.
Problems arose at night when Cooper got cold - the boat's cabin often went below 50 degrees. We solved the problem by letting him sleep with us. No more getting up in the middle of the night!
Overall, we were amazed at how well Cooper adapted to life aboard. He really enjoyed the experience, particularly the shore excursions. For a little guy, he has great endurance, as kept up with us on some long hikes - up to 12 miles.