CBD Hemp Oil (Hemp cannabinoids) are dietary supplement products for cats and dogs which are made from the hemp plant. Hemp is a variety of marijuana (Cannabis sativa), but because it contains lower levels of the psychotropic compound, THC, it has traditionally been used to make products such as rope, textiles etc., rather than used recreationally or medicinally. (CBD Hemp Oil is made from Hemp flowers, stalks and leaves. In contrast, Hemp seed / oil is made from the seeds of another variety of Cannabis sativa.)
CBD Oil products like Canna-Pet®, Canna Companion etc. are marketed to help with anxiety issues, pain relief, inflammation, nausea, digestion etc.. CBD Oil supplements are not psychoactive (they don't produce a "high"). They contain various beneficial cannabinoid and terpene compounds which have been extracted from hemp.
Hemp supplements are available as soft gel capsules, chewable treats, and oils.
(Rate CBD Hemp Oil for canine behavioral issues here)