Rated 3 out of 5by RAB1 Didn't work very well for us. We bought three of these collars for our dogs. Actually, we tried to buy four, but they only had three in stock, and after having tried the first three, we didn't buy the fourth.
We had problems with the collars not working on our long-haired dogs (Newfoundlands#. We pulled NUMEROUS ticks, fat and healthy, off of our dogs after they'd been wearing these collars for more than the 48 prescribed hours to get them going. Our vet told us to tighten the collars, and that did help, but we still found ticks latched on #and alive#.
On our short-haired dog #lab), the collar seemed to work fine.
The biggest problem, though, is that they lose them. We only have one collar left out of the three, and that's an expensive loss. At the price of these collars, they should have a true clasp on them, not just the slide-through end.
Also, we were told that they had a $20 rebate. That is true, but it's limited to two per household, which we were not told.
As for whether they last eight months, I can't speak to that, as we haven't had them that long. 07/28/2013