An American Breed
| Breed Info | | Acquiring a Dog | | Club & Registry | | Resources |
| Coat Color and Pattern in English Shepherds Black mask (on a sable dog) Black masks most likely result from the action on an allele at the "extension" locus. This allele is relatively dominant, so a dog that inherits one copy of the allele (e^m) will have a mask. Dakota  |
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