yeah or maybe a ramp that goes over the sink instead of all the way into the cabin. That might be a much better option than what I posted above.How about a different angle. Put a cover on the sink and let him walk along the counter? Can't tell how hard it would be, to get down from the other end, out of view on the left.
For all you folks with big dogs or just would like an elegant boarding solution, if we can get six or more who want one, I can get side accommodation ladders similar to this one produced for around us$3500.00 each.My 65 Lb. nine year old standard poodle has difficulty with our similar companionway stairs. We have a plastic container with six life jackets inside that we got from west marine years ago. We place this against the bottom of the ladder and the dog has no problem continuing on up the ladder using this as the first step. A cooler would probably work also. We then toss the life jacket container onto the quarter birth until he needs it again. Getting back aboard from the inflatable is the next problem for you to solve.