Most of the effective worm medicines cannot be purchased legally over-the-counter. They are prescription preparations that drugstores do not carry, which force the veterinarian to maintain supplies to dispense. This is necessary since with one exception each of the more effective preparations has specific problems associated with it. Your veterinarian will explain them to you.
Several of these drugs are given by injection. As some must not be administered to a dog with heart worms, a blood test for these parasites must prove negative before the medication can be safely given. No worm medicine is nap percent effective n.00 percent of the time, so don't be alarmed if one treatment is not successful. For example, tapeworm medication will digest the bodies of the worms but occasion-ally will not destroy the tapeworm heads. The remaining head requires about three weeks to develop into an eighteen-inch worm, which will start shedding terminal segments again, so it behooves you to watch freshly passed stools for new segments, the evidence needed to rewrote dog.





