
It really varies, characteristics of any of the ancestors can come though, even those a long way back, the closer to the pup or more represented in the pedigree (as in line-breeding) then the more the chance of those traits showing in puppies.
Some studs and broods stamp their progeny with their look, others tweak, improving this or that trait without changing the overall look.
A lien-bred stud or brood is more likely to produce pups strongly similar to that line.