We have them all over the place. I also have 2 golden retrievers that hate them. I have never figured it out. A squirrel can walk past my older golden and he doesn't even notice. If a chipmunk is anywhere in the lawn the old boy chases after it like it's public enemy number 1. Of course, he then comes in, lies in front of the air conditioner vents, and takes a 2 hour nap. The pup goes after both squirrels and chipmunks.