With a cross - you can't pick and choose the characteristics you get. You get a random selection of good and bad from both breeds. And if there is bad in both breeds - you probably get that eg Hip Displasia on both sides or eye problems - you double your chance of getting that in the puppy. But if one side sheds and the other doesn't - you may as well toss a coin.maltese cross shihtzu is to get the non shedding characteristic off the shihtzu but with a maltese face
It is wrong for cross breeders to make promises about getting the best of both breeds like you can dial up what you want. You can't. Not yet anyway. DNA tech is not there. If somebody made these kinds of promises about their puppies I would look elsewhere to buy.