Works Great!

I used this on a 20lb dog. Works great. Makes a sound to warn and after a day or so that is all it took. I placed it on a 12 lbd dog also. I have to say for that size dog the box is a bit large. I would say anything under 15-20 lbs the box will be a bit large. The battery life is great. I have used it almost a week and have not had to recharge it yet. Over all a great purchase but way to big for a toy breed.

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