Why even bother with it? You already know a littermate has a full on case of deafness, so just skip on that litter, or possibly even that breeder all together and get something that's more genetically sound.
Just friendly advice, you may take it or leave it.
That would be good idea, but he would have to avoid every breeder that had a Merle color dog whether it was cat, aussie, leopard hound, collie, and farm Shepard's. Oh and dotsons lol. It is very much genetic but is also directly connected to the mutated Merle gene, in most cases double Merle but in some as Mr Whitten mentioned the ghost or "Cryptic Merle".
http://www.fairmatecatahoulas.com/merle-gene.html
Poll
