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| Modern Dog Back to Basics Collar Size Chart | |||
| Size | Neck | Width | Common Breeds |
| X-Small | 10"-13" | 1/2" | Chihuahua, Mini Doodles, Yorkie |
| Small | 12"-15" | 1/2" | Cavalier King Charles, Boston Terrier |
| Medium | 16"-19" | 3/4" | Australian Shepherd, French Bulldog |
| Large | 18"-22" | 1" | Gold Retriever, Labrador Retriever, Boxer |
| X-Large | 22"-27" | 1" | Bernese Mountain Dog, Cane Corso |
| Modern Dog Harness Size Chart | |||
| Size | Neck | Chest | Common Weights |
| X-Small | 12.3"-15.8" | 17.5"-20.8" | 10-17 pounds |
| Small | 14.5"-19.5" | 19.8"-23.5" | 17-30 pounds |
| Medium | 17.8"-23.5" | 22"-29" | 30-50/60 pounds |
| Large | 18.5"-27.5" | 25.5"-35.3" | 70-90 pounds |
| X-Large | 22.8"-33.5" | 27.5"-37.3" | 90+ pounds |