First, I would first ask the Park Service if its allowed to be used on other animals before proceeding. They may have policy that strictly prohibits use to anything but "attacks" by bears. I would wager they or the state wildlife agencies may see this type of "aversive" action as harassment for animal like a skunk, i.e. not physically dangerous despite their nuisance.
Not sure other than that. I don't deploy the stuff unless I am in physical danger as they can and often do cause harm to the human user since we rarely have "ideal" conditions, i.e. windless.