My b doesn't (usually) pull so I can't say for sure, but even at its tightest, the collar won't cut off air entirely. The tightness of the collar is limited; if you order one of the custom ones from Long Dog, you get to specify the smallest circumference of the collar. I would imagine a wide leather collar to be preferable to a thin nylon one for a puller, just because it won't chafe or cut into his neck as much.
What size martingale collar do you use?
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My girl is 7.5 months now and she is great at not pulling on walks but I would like to use a martingale collar. While she is not fully grown would it be beneficial to buy a 12 inch collar (i think this is the correct size) or what for when she is fully grown?
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You need to be careful with martingale collars that they are not too big, as the dog may be able to back out of them. I think you would need to try the collar on your dog to know if it would be appropriate. When tightened it should not be able to come off!
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We bought them from www.halsbanden.com - she also sends outside the Netherlands. She will ask you to measure your B's neck. They fit perfectly!
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This page has great illustrations for proper measuring. Hope it helps.
http://www.2houndsdesign.com/How-to-Measure-for-a-Martingale-Collar.html
