This little shop of horrors is home to more muttpuppies than you could shake a stick at. In a muttpuppy cage match, I don't know who would win - Chinzilla, or Cujo (pictured), the "mastiff" they created using a pug, a Shar Pei, a cocker spaniel, and an English shepherd. A gun dog, a sheepdog, a lap dog, and one mastiff (barely).
The theory is that those four breeds combined with a real Saint Bernard will produce something that vaguely resembles a Saint in mini form. I bet they think Shelties were the product of rough collies, cocker spaniels and a Chihuahua! I can't wait till their litters turn out to have Peke markings and faces and cocker ears and eyes - because since when is breeding mutts ever predictable? Now, I concede that Saint Bernards are members of the mastiff family (Molossers is the technical term), and if you HAD to create one using a real Molosser would make sense - but I do mean a REAL Molosser, like a Spanish mastiff for build, or a Leonberger for the sable colour. But, of course, none of these are small enough to experiment with!
I feel I should also point out that small dogs do not necessarily apartment dogs make. You can breed a sheepdog as small as you like, but it's still going to be busy little dog. If you live in an apartment and are looking into getting a dog, I hope you're looking at more than just size! Heck, many people consider Great Danes to be good apartment dogs! Those giants can fold themselves up in a corner like a Chinese contortionist when they want to. And of course there are factors to consider like your schedule and how much time you can devote to exercising your pup. So the "apartment dogs" excuse for breeding small just doesn't work for me!