CBD (cannabidiol) is a compound found in cannabis and hemp. THC (tetrahydrocannabinol) is an active ingredient compound that gives marijuana its psychoactive properties.
The hemp plant by nature contains a minute amount of THC (.03% or less), which is considered non-psychoactive.
Products such as NANOSOL™ Pro filter out all THC and certifiably claim to be THC free without diminishing the CBD Hemp Oil purity and strength. Removing all THC intended as a primary benefit for the human market, this benefit deemed valuable and extended to the pet market.
In short, a THC free CBD Hemp Oil formulation achieves supplemental benefits without concern of THC side effects.