This article is from the Genetic Diseases in Dogs FAQ, by Gary Mason.
Since genetic diseases are passed to subsequent generations by parents
who contribute the causal factors contained within their own genetic
makeup, one point regarding this problem is fundamental:
The elimination of genetic diseases can only be accomplished through
selective breeding
The problems lie in determining how to identify the diseases' causal
factors in dogs; in understanding when not to breed them; and in the
implementation of selective breeding programs based upon these
factors. Some of the avenues to be investigated include:
 
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