
I saw some years ago someone trying to get a new breed going by crossing Min pins with pugs and the results looked like a min Rott in the one picture I saw (I think they called them Carlin Pincher) but to be honest a smooth black and tan smooth Griffon would be about the same look and you would know what it would turn out like.
As I have often said before to develop a new breed with a healthy gene pool firs the original stock to be crossbred has to be of impeccable health and temperament,a nd then lot sand lots have to be bred (and found homes for) that are not going to have the desired characteristics of the new breed. there will b e just a few that have the desired traits and these then need to be bred together and in the next generations lots more that don't anywhere near meet the requirements will be produced.
With current canine overpopulation, saving and maintaining the breed we have can be justified, but producing new ones with all the wastage that would entail cannot be considered so.
Of course in a well bred pedigree litter there will only be a couple of outstanding pups, but all the rest will at least be typical of their breed, where in these attempts at new breeds they won't for generations, and to get enough founders for the breed (the ones that have the desired traits not their parents and siblings), and awful lot of breeding would have to be done.
Ask any one of these crossbred pups breeders what standard are they breeding to and you will probably get a blank stare. Before they even start they should have a standard in mind of what they are trying to achieve (other than saleable pups), cuteness doesn't cut it as there are cute dogs aplenty with no homes.
Yes I now there are some successful crosses, usually in the hunting field. Crosses of gundogs, or crosses of sighthounds with terriers or other working breeds have a distinct purpose and the traits are usually compatible. Breeding together dogs of very different drives and nature will not give you anything predictable.
Take the Pug and Beagle. One is a lap dog, with a short face and heavy body, no canine athlete. the other is a hound with strong hunting instinct. So who would b e looking to buy such a dog? Someone who wants a country companion with a hunting bent? or someone looking for a lap dog? If the latter how are they going to cope with a pup who wants to chase Rabbits and disappears into the next country on walks, and then finds it's exertions too much for it's Short face?