We only have this product for 3 days. My husband had to pull very hard to tighten the collar. I couldn't move it more than 3 levels. I don't know how effective this product will be over the next 4 months but we are on day 3 and still not getting enough fleas. I bought collars for dogs and cats from this brand. Update: 2 weeks and the collars don't work at all.
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