Instruct: Classify Amazon reviews into positive or negative sentiment
Query: We are repeat customers

We have been using this product for many years and, for the most part, it seems to work. We are in an area every summer that has a lot of deer ticks. We do occasionally find one of the critters on to our dog. Sometimes just crawling around the fur, but once in a while, imbedded. So we remove the tick manually. Our sense is that the product prevents more ticks from latching on, given how many there are in the area. Also, we believe (or hope) there is a cumulative effect, meaning that using it for several months consecutively builds up the effect of the stuff -- but that may be wishful thinking on our part. Equally important, we have seen no adverse reaction on our dog, which is at least as important to us as preventing ticks. Obviously, other dogs may have reactions but, so far at least, we have not.