Created with the idea of putting a stop to the hassle and distress of forcing pills down your dog’s throat, Flex HJ comes in an oral spray that does not break down during the progression through the body as pill forms do. Buy Flex HJ today. dogs, joint pain, flex hj, glucosamine, pet pain relief, pain relief spray for dogs, joint pain spray for canines, animal joint medication. http://www.flexhj.com.