They don't look like wiemeraners Obviously if your brother's fiancee is a "good breeder", and knows what labs actually look like (let's hope a breeder of labs for 25 years would know what the heck one looks like) she should realize that they look VERY different. You know, people used to be as skeptical about chocolate labs, and said that they were lab chesapeake crosses.
This website http://www.labbies.com/genetics2.htm#Silver clearly states this :
"When one traces the pedigrees of some silver Labs, one finds a history of other color oddities occurring in some related bloodlines to the silver Labs. Occurrences of "black-casting" in chocolates, muted chocolate coloration ("card-board box" coloring), as well as the occasional occurrence of black puppies being whelped from two chocolate parents suggests that these "chocolates" were probably not chocolate at all but rather E+ yellows. As such, it is conceivable that the Agouti alleles could produce an intense red pigment resulting in deep red (interpreted as chocolate especially in the absence of "saddling" modifiers) or diluted, muted red (card board box color) due to further modification by the alleles of the C locus). In black Labs, an ayayEE+ geneotype could produce a muted black color (because of the presence of both receptor types) especially if the alleles at the C locus were cch, thus resulting in a deep charcoal, silvery coat appearance. This suggests a possible role of E+ for the silver coloration as well as for a multitude of other coat color variants that occasionally occur in the breed."
Colour mutations are not rare in the dog world. And niether is a colour long-forgotten appearing in a line. It's what happened with white german shepherds. White shepherds started appearing in litters, and when the lines were traced back to old Germany, they found after close examination, that a few white dogs WERE used in the making of the german shepherd dog breed. Also, although not common, golden retrievers have been known to have black blotches covering the body, due to the black dogs used in making the golden retriever breed.
Looks like it's time to bring out the old punnet squares
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