I am not sure when they update that or if any new research is available.
"How is megaesophagus inherited?
This is an autosomal recessive trait in the wire-haired fox terrier, and autosomal dominant in the miniature schnauzer. The mode of inheritance has not been determined for other breeds that are predisposed to this condition. "
"What breeds are affected by megaesophagus?
Chinese shar pei, German shepherd, Great Dane, greyhound, Irish setter, miniature schnauzer, wire-haired fox terrier.
For many breeds and many disorders, the studies to determine the mode of inheritance or the frequency in the breed have not been carried out, or are inconclusive. We have listed breeds for which there is a consensus among those investigating in this field and among veterinary practitioners, that the condition is significant in this breed."
Affected wire-haired fox terriers, their parents (carriers of the trait) and siblings (suspect carriers) should not be bred. Affected miniature schnauzers should not be bred.
In other breeds in which inheritance is unknown, it is safest to avoid breeding affected dogs, their parents and siblings."
Back to no quotes. This site has good information: http://www.upei.ca/cidd/intro.htm
And the GSD list here: http://www.upei.ca/~cidd/breeds/germanshepherd2.htm
For Myasthenia Gravis: http://www.upei.ca/~cidd/Diseases/ne...a%20gravis.htm
which I had not even realized was in dogs...scary.