my son gave this medication to our puppy after we purchased him .
A German Shephard with worms. We purchased and the same day the breeder called and told us to be sure and worm because other new owners called them complaining. My son wormed our 9 wk. old pup with RFD and the next morning there was poo with worms in it. disgusting. I would have to say that RFD worked quickly. We will give second dose soon as possible. RFD worked.