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Originally Posted by darci
What are some of the major health issue's that can happen, besides the overbite and flufflies that you mentioned?
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It depends upon the breed quite a bit and the mode of inheritance. We can look at KatC's example of the temperament of her GSD. Temperament is very much an inherited trait. The line of the grandsire or granddam of her dog may have been prone to a more nervous type temperament. Once it was doubled up on in the brother sister mating, then it was "set" in the puppy/her dog. Environment can only go so far in overcoming an "iffy" type temperament and in someone else's home KatC's dog might have become a fear biter and even euthanized due to the nervousness of her temperament.
PRA, which is an eye problem in Cardigans, has an autosomal recessive mode of inheritance - which means both parents have to carry a gene for it. Parents eyes will be fine, but IF one breeds a carrier to a carrier then there is the risk of puppies that will go blind.
Really though, I can't think of a serious health issue that can come out of an inbreeding that could not occur in any of the other types of breedings. Now if a breeder has a specific health problem in their line and continues to breed closely, inbreeding or even close linebreedings, then they are only going to continue to perpetuate the problem. That is why it is so important to know one's dogs, what is behind them and be honest about them, in order to make responsible decisions as to when to implement which of the breeding
methods.
Debbie