[Elaine]

I use the plain Heartguard just for the summer months and nothing for worms. Should I suspect my dogs have worms, I will test them to find out what they have and then treat with the appropriate meds. There is no reason to use an intestinal worm preventer unless your dog is hanging out with a lot of sick or untreated dogs. I have never had to treat my dogs for worms other than when they were just puppies.