Be sure you are very careful using this stuff; if your dog already has worms this will kill him; this is way outside of what the directions instruct. Not to say that it cant be used, but clearly not something to just read about on a forum and try. I asked a vet friend of mine about people doing this and he couldn't believe anyone would try it, but I know that many have for many years. Keep in mind that collies and a few other similar breeds will also die from this, so proceed with caution. I just saw IFA in my town still has it. Best of luck!