CBD is a one of the many active chemical compounds found in the Cannabis Sativa plant called cannabinoids. Both the hemp and marijuana plants belong to the Cannabis genus, however, hemp contains less than 0.3% THC levels and is legal across all the 50 states in the US. THC is also a cannabinoid, and unlike CBD, it is known to cause psychotropic effects when ingested in human beings and animals. As a result, it is illegal in most states. CBD does not have any psychoactive effects, instead, it offers a wide range of therapeutic effects, some of which may prove helpful in keeping your horse healthy.