i should have used not always true instread of incorrect, i typed to quick
my experience is with the yorkie poms
i had two, with different parents, but related the pups look alike except for the coloring was a shade different.
i had puppies they mainly looked alike i had to blonde and one dark sable
if i reseach that breed for example on dogster.com most look a like, of course color may very depending on what color the parents are. like using a black pup with a yorkie you will more than likely have dark puppies. now i have seen where they dont look anything like mine, but i think that most of that comes from the breeder and the dog.
most look similar in looks and hair type. but i think that some breeders also dont watch the line enough to know what they are getting. some people dont care, while others do. the breeder i got mine from, all of hers look alike some turn out blonde and some turn out a red color, but their features are always alike.
just like a cock a poo, most look similar
yorkie poo, most look similar
i think it depends on the breeder and the dogs used
but yes sometimes you get some that dont look like what you saw somewhere else and personally i think that has a lot to do with lying about what its mixed with, or omitting something about the parents