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Animals have an endocannabinoid system just like humans do, including cannabinoid receptors, endocannabinoids, and metabolic enzymes from within the body that interact with each other and external components, like phytocannabinoids. A large majority of research on the endocannabinoid system (ECS) has been focused on humans, but there are some things that are known about animals, too, which can be helpful in veterinary practice.