Other breeds that are affected are Old English Sheepdogs, Shelties, German Shepherds, Border Collies, Australian Shepherds, longhaired Whippets, and two breeds that are not very well known, the Silken Windhound and the McNab.
Two drugs that are very popular for use in dogs
that should never be prescribed to dogs
with the mutation are Ivermectin and loperamide (Immodium). Heartgard, a very popular heartworm preventative, contains ivermectin.