If you are breeding the smaller male to get a pup with his same unique personality your playing the luck of the draw and more then likely your going to lose because he/she may have an entirely different personality. Its a misconception that if you only have 1 litter of pups that you are not a breeder because yes you are. Whethers its 1 litter or 100 litters makes no difference. Yes, there are a huge amount of complications and problems that can occur with a litter of pups. Even if the bitch free whelps she may reject the puppies or her milk may dry up which leaves you up ever 3 hours for bottle feedings for weeks! I don't want to sound harsh, just realistic, I'd seriously reconsider and adopt another companion if that's what you looking for.