Here is my opinion about such CLOSE "line breeding":
Line breedering (and certainly inbreeding) should ONLY be done by a VERY experienced breeder, and ONLY if the genetics you are trying to magnify are something that you really really want to magnify (ie, you have a great dog that is almost PERFECT in every way, and has at least obtained a CH title).
I have seen a lot of inbreeding with dogs here in Missouri, and it is not being done by experienced breeders, but by "backyard breeders" and substandard "puppy mills" who just don't want to spend the money to buy dogs to out breed, and, they honestly aren't paying much attention to which males are breeding with which females.
Any breeder who responsibly line breeds, I would think, would be so excited about finally having a perfect dog to line breed that they would be very up front about the lineage of the puppies. And, if a breeder is line breeding so closely, then they would seriously want to evaluate every single pup in the litter for a long time (I'd say at least a year). Evaluation takes quite a while when you are talking about possible genetic medical issues, conformation, coat coloring, breaking patterns, etc
It is not uncommon for puppies to have the same ancestor on the Sire and Dam side at some point in an long (8 generations or so) pedigree, much less common in a 4 generation pedigree, unless there is a LOT of red in it.
Just because the AKC will register an inbred dog (even littermates bred to each other), doesn't mean it's always a good idea.
JMO |