Red Dingo Reflective Martingale Dog Collar, Medium

This is the only type collar I will use for most herding dogs. Their head is often times smaller than their neck so this tightens up without chocking. It is usually hard to find in smaller sizes though

Great size, great concept of self tightening as the dog pulls on her leash. Good color and pall around look.

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The only things that I can complain about is that this collar isn't quite reflective, the reflective material needs to a lot of light and in the correct angle to illuminate, and that isn't that easy to adjust to your dog's neck.

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