TABLE 1.
Approximate breed frequency of the MDR1 mutation in dogs
| Breed | Approximate frequency |
|---|---|
| Collie | 70% |
| Longhaired whippet | 65% |
| Australian shepherd dog | 50% |
| Mini Australian shepherd dog | 50% |
| McNab | 30% |
| Silken windhound | 30% |
| English shepherd dog | 15% |
| Shetland sheepdog | 15% |
| German shepherd dog | 10% |
| Herding breed cross | 10% |
| Mixed breed | 5% |
| Old English sheepdog | 5% |
| Border collie | <5% |
| New to the list | |
| Black Mouth Cur | 8/26 dogs tested |
| Boxer a | <1% |
| Chinook | 4/13 dogs tested |
| Carolina Dog | 4/13 dogs tested |
| Siberian Husky a | <1% |
a
Determined by pedigree and DNA breed analysis to be purebred.