HempRx Soft Chewz were formulated by Robert J. Silver DMV, MS, CVA and contain a standardized percentage for the essential oils derived from organically-grown, whole hemp. HempRx Soft Chewz contain naturally-occurring terpenes, flavonoids, and phytocannabinoids. They are gluten and grain free and have a tasty flavor for both dogs and cats. Each feline chew has 1 mg of whole hemp botanical oil. The chewz are manufactured to a very high standard.