CBD Hemp Oil (Hemp cannabinoids) products for cats and dogs are made from the flowers, stalks and leaves of the Hemp plant, which is an industrially grown variety of Cannabis sativa.
Hemp contains very low levels of the psychoactive cannabinoid THC, and has traditionally been used to make products such as rope, textiles etc., rather than used recreationally or medicinally.
CBD Oil products like Canna-Pet®, Canna Companion etc. are marketed to help with 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.
(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.)
Hemp supplements are available as soft gel capsules, chewable treats, and oils.
(Rate CBD Hemp Oil for canine behavioral issues here)