Panacur Canine Dewormer 2 gram Panacur (fenbendazole) helps treat hookworms, roundworms, tapeworms, and whipworms in dogs. It is used by veterinarians to treat other parasites as well. It is available as 1Gm, 2Gm and 4Gm powder packets. The usual dose for dogs is one packet, based on weight, given once a day for 3 consecutive days. The medication can be mixed with a small amount of the animals usual food. Dry dog food may require slight moistening to allow for proper mixing.