i wouldn't do you any good, i don't know doxie specifics. Busterduck on these forums does, and has done a lot of research into them. If you really want good sound advice email her.
i do know one has to be a dapple to produce a dapple, and the doxie peeps would rather see the dappled ones eliminated from the gene pool entirely, because it is hidden and because many breeders sell pups even born as dappled who turn solid, as solids (like yours did). The doubled gene (homozygous) causes such devastating health effects when it's inadvertently doubled up on. My response would be to begin color genetic testing for it, then make good sound breeding decisions (like some of us do in Rockies). There are markers.
Cattitude you are right, some peeps do what you're talking about, and unfortunately you can't make a difference no matter how hard you try to educate.

But some do change their philosophy once someone takes the time to educate them. You just can't tell the difference between the two at first. Our saying is Don't Alienate Educate.
Moving here was a complete culture shock for me when realized the vast number of peeps using dogs as the cash crop.