>>>There are no homeless mastiff puppies<<<
Puppies are easy to find homes for. I think we are saying that eventually a lot these DOGS wind up mistreated or homeless regardless of their breed or cost.
That is why organizations like the one listed below exist!
http://www.conceptsdesign.com/mastiff/
Is that really a big issue with $1500 registered dogs? I saw the link, and it looks like the fostering organization is doing great things, but I cant imagine that its more than one in a thousand dogs that are actually homeless (as in abandoned). If nothing else, a free add in a paper or a conversation with a few friends would get them at least a temporary home.
Sure, theres always a few nuts who dump their pets in a fit of rage (and beat their kids in the next eruption) but I dont think making fewer $1500 dogs available helps that measurably.