Dog wormers can be used at 2 weeks of age for preventative purposes and at intervals of 1-3 months thereafter. For treatment purposes, once a week until worm-free. Some dewormers are recommended to be given orally after meals as they are more irritating to the stomach and intestines, but some dewormers require it before meals. So it is important to make a judgement based on the type of dewormer and the age of the animal at the time of use is oh so.
