I don't deworm my cats or horses unless need be and my dogs only get heartworm medication. It really does depend on your setup. We don't have a high parasite load here. My horses have plenty of pasture with rotational grazing and are never confined. When I had 3 times as many horses and they...
DE mostly kills external parasites but will kill some internal if they eat it. Pepper will kill some parasites. These items will keep a low parasite load lower but they will not treat an infestation or animals living on land with a heavy parasite load.
The ideal way would be to have a fecal...