Idk, in my war against possums I use the Granular Predator Urine Repellent from https://stoppestinfo.com/239-how-to-get-rid-of-a-possum.html. I will get 28.5 oz fox urine of granules for $15.95I think it is a good price. They scare away not only possums, but also other harmful animals from your place, and neither you nor your pets will suffer from it.