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| Breed | Count | % of shelter sample | Avg. concentration (%) |
|---|---|---|---|
| American Staffordshire Terrier | 128 | 27.8 | 45.5 |
| Chihuahua | 82 | 17.8 | 39.6 |
| Poodle | 67 | 14.6 | 30.6 |
| German Shepherd Dog | 55 | 12.0 | 30.0 |
| Labrador Retriever | 39 | 8.5 | 35.9 |
| Boxer | 38 | 8.3 | 28.6 |
| Cocker Spaniel | 34 | 7.4 | 25.0 |
| Yorkshire Terrier | 30 | 6.5 | 41.3 |
| Dachshund | 25 | 5.4 | 22.0 |
| Maltese | 22 | 4.8 | 25.6 |
| Mixed (beyond three generations) | 388 | 84.3 | 37.4 |
