Worming is caused in dogs due to various reasons. Worms in a dogs body absorb the nutrition i the food consumed by the dog causing illness to the dog. In some extreme cases, the presence of parasites in dogs can be fatal too. It is very important thus to keep a check on the growth of parasites inside your dogs body. Worex Dewormer For Dogs are tablets that kill the internal parasites in a dogs body keeping him healthy. Treatment may require more frequently depending on parasitic load and their prepatent period. In Bitches, it should be given once prior to mating, once at 2 weeks and at 4 weeks after the puppy birth.