Table 2.
Breeds Known to Have the MDR-1 Gene Deletion
| Australian shepherds |
| Miniature Australian shepherds |
| Collies |
| English shepherds |
| Longhaired whippets |
| McNabs |
| Old English sheepdogs |
| Shetland sheepdogs |
| Silken windhounds |
| White German shepherd dogs |
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