as a relatively "new breed" (1930's) wairehaired's haven't really got any uniformity on their coats and it is possible to throw up a very smooth looking pup in a litter, sometimes the wirehair will break through after a few months and sometimes not. I can't see why the breeder can't register the 2 pups as wirehaired vizslas though assuming that both parents are registered wirehaired vizslas..
"never argue with stupid people, they may drag you down to their level and then beat you with experience"..Mark Twain
Ruby's d.o.b. 21/6/2011,,Lyharr Grouse Shot d.ob. 7/01/2015