Until the public can see, widescreen mixed breed testing, that is available for all pure-breds, then for me it is just a myth.
One of my little projects for this summer, is to video-tape dogs out in public who have obvious movement problems. It is astounding to me, that when I watch dogs move, (I just seem to do that naturally) out in public, how many of them move so very poorly.
Another caveat, that just because you mix a supposed hyp0-allergenic dog with another breed that is not hypoallergenic, that the coat will always be of the hypo-allergenic type. I say BALDERDASH to that assumption.
Now let us say you breed a Maltese with a Yorkshire Terrier, both these breeds have high incidence of LS. Do you really think you are lowering the chances of LS free pups? Again I say BALDERDASH.
And it truly ASTOUNDS me why anyone would pay high prices for a mix!
The marketing hype in this case, is so pervasive that the public has bought into the myth.
I remember my husband spending several hours over several days with a co-worker, who wanted a pup, for his young tween girl. They went through all the reasons for purebreds, looked at several breeds. Yada Yada. The next thing hubby hears, that co-worker bought a Labradoodle or some such, for his daughter; cost was $1200

For a mixed breed dog. Sigh.........