do the math.
a typical 40 ft sailboat has a usable interior square footage of around 280 sq. ft.
Would 2 crew members, and a couple of dogs be "comfortable"?
Yes, it has been done, It is being done now, and it will be done in the future... but so has shooting your self in the arm. Doesn't mean its the brightest of ideas.
It would be my opinion that the answer would be...
"hey, I can live in a washing maching carton, but would I subject my pet to it?"
The choice is yours., let us know how it turns out for you.
We are not primarily on earth to see through one another, but to see one another through
Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs