I have yellow and green in a regular collar (large - photo below), martingale (medium - photo above) and a leash (not pictured) . So far I'm happy with all three. I needed a regular collar to wear this cute headscarf I bought at an arts and crafts fair. The big one was too big for her and she was able to slide out immediately. Blueberry staff recommended a medium I bought from Martingale. In any case, she is used to the martingale as she is quite strong. The third picture shows her whole body with a tape measure as a yardstick. The top of her neck near her ears is 15.5 inches in diameter and 18 inches in diameter at the base near her shoulders. She hovers around 160 pounds. I hope this information will help others with their purchase.
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