How about potty time? How have you trained and where?
We've had two dogs of the same breed since acquiring our PNW cabin cruiser in 1998, and for two years we had both of them together. We never discouraged them from relieving themselves on deck. The dogs have had no real qualms about this but they've both preferred to go to shore, mainly because it means playtime. The breed loves the water and so the shore trips are a great way to get them exercise doing what they really enjoy doing which is retrieving from the water. And it gives us a chance to get some exerciser, too.
We take the dog ashore at least three times a day, the last run in being about 9 pm.
RJ was introduced to the cabin cruiser about halfway through his life. Albi's first trip on the boat was when he was nine weeks old. When Albi was still just a puppy we were on our way back to Bellingham and he needed to pee. So I took him out on deck and he lifted his leg (he learned to do this the day we first got him home by watching RJ) against the side of the forecabin.
I had my back to the bow watching him when I heard this huge roar behind me. I turned around to see one of Customs and Immigration's big gray, triple-outboard SAFE boats doing a powered 180 off our bow and heading away. The entire crew was laughing.
My wife, who wsa driving, told me that the boat had come speeding toward us with its light flashing, presumably to board us or whatever. But when they got right up to us they saw Albi peeing against the cabin and they burst out laughing, waved at my wife, spun the boat around, and roared off. I guess they figured that anyone who was carefully monitoring a puppy peeing on their boat was probably a law-abiding citizen.
First photo is Albi at eight weeks, last photo is Albi a couple of years ago.