Linebreeding - Page 2

The thing about inbreeding / ultra-close line breeding, eg brother & sister matings,
in any breed of dog  (or in mongrels, come to that !), is that closely inbred dogs
carry more matched genetics.  That means that eg recessive problems of structure,
dentition, general health & specific congenital diseases, or even the predisposition
to get other illnesses later in life, are all 'doubled up on' in the genetic lottery.  That
means problems show up earlier and in statistically larger numbers.  However...

You can have very good dogs in this first generation;  or you can get unlucky and have
really unhealthy ones.  So in many ways no different to the luck of the draw on how
ANY pup turns out.   The sort of 'two heads, three legs, no liver' defects usually only
emerge further down the line if you KEEP mating inbred dog to inbred dog.   As long
as there is no intent to repeat this accidental mating between siblings, and no likelihood
the pups from the first litter are going to breed with the pups from the second litter, and you
are not planning to get another puppy from such breeding to mate to your choice this time,
you really have as much chance, other than 'statistically', of getting  healthy pups who stay
healthy into adulthood  as the next buyer, who is looking at total outcrosses.

Not every 'bad' gene that gets inherited is about health concerns, either.  You could end
up with a normal healthy pup that has just turned out the 'wrong' colours or ear-type, etc.
It really IS a 'crap shoot'.  You say you do not intend to breed, OP, so just stick to that
and enjoy your choice of puppy, I hope it turns out just fine and you don't get problems -
but remember, there are always problems you could get, even with the most well worked
out and careful breedings !

The first question that should be asked is; were the parents related, were there any dogs from their pedigrees that were related?  If not and there have been no health issues from either parent then the brother and sister breeding is just like breeding the parents again.   I breed  x Malinois/ x Dutch Shepherds from KNPV bloodlines from the Netherlands where they breed brother n sister, sister sister in a line and in most cases it really makes the finer points of the dog come out.   I own a male black Malinois named Boomer and he is bred back to his grandfather from his mother's side.  What happened is amazing Boomer is the exact copy of his grandfather, which is his fathers father, so the inbreeding went back one generation more.  Which is perfect for what we were wanting because his grand father is the famous Tommy Luijken, and Boomer is a perfect copy in my opinion. 
  Some people say Linebreeding has to be across the lines from the mother side and then on the father's side and not just in one parent.  Although if it is in one of the parents it was linebreeding at some point lol.  A ton of the KNPV dogs aka working police K9's have linebreeding in them, they have been doing for over 60 yrs.  Search Boomer Reign and look at his breeding, or go to www.bloedlijnen.nl and look at his nest http://www.bloedlijnen.nl/pdfneststamboom.php?ID=3348');