Yes, I use it and it works very well. My dogs were getting worms on a regular basis, but I hate using chemiclas and as the wormers only worked at that moment, they kept getting reinfected. Four Seasons works as a profilactive (preventitive) so they have it 2 days a month and since they have been on it, which is about 4 months now, they haven't had worms once. Smells like vinagar though! :p