I don't think these collars work

I liked how it was just a collar. My yorkie wore it religiously and never took it off. Lo and behold, last night, about 3 months into wearing it, i must have pulled at least 10 ticks from him. :( i found a few stray ticks here and there in the past, but 10 was crazy. Many were still alive too. I dont think these collars work.

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