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| Breed | Count | % of shelter sample | Avg. concentration (%) |
|---|---|---|---|
| American Staffordshire Terrier | 110 | 24.0 | 37.4 |
| Chihuahua | 110 | 24.0 | 38.0 |
| Poodle | 70 | 15.3 | 32.9 |
| Boxer | 51 | 11.1 | 34.6 |
| German Shepherd Dog | 39 | 8.5 | 24.7 |
| Labrador Retriever | 37 | 8.1 | 20.9 |
| Cocker Spaniel | 31 | 6.8 | 23.4 |
| Australian Cattle Dog | 30 | 6.5 | 25.8 |
| Dachshund | 27 | 5.9 | 20.8 |
| Shih Tzu | 25 | 5.4 | 29.5 |
| Mixed (beyond three generations) | 419 | 91.3 | 37.3 |
