This is the only thing that works on the bizarre critters in my wooded/lawned yard. I use one on one of the pets and it seems to keep pests away from all three pets. I picked the dog to put the collar on vs one of the two kitties because she's badly allergic to flea bites. Even though she's got stupid sensitive skin, it doesn't seem to bother her at all. I had it on for a full month and took it off easier than I thought it would come off to give her a bath.