Affected Breeds
Approximately 3 of every 4 Collies in the United States have the mutant
MDR1 gene. The frequency is about the same in France and Australia, so it is
likely that most Collies worldwide have the mutation. The MDR1 mutation has
also been found in Shetland Sheepdogs (Shelties). Australian Shepherds, Old
English Sheepdogs, German Shepherds, Long-haired Whippets, Silken Windhounds,
and a variety of mixed breed dogs.
The only way to know if an individual dog has the mutant MDR1 gene is to
have the dog tested. As more dogs are tested, more breeds will probably be
added to the list of affected breeds.
from MSNBC News. Aug 3, 2004
Last Edited: Jun 22, 2007 4:55 PM
