ThunderWorks’ ThunderWunders for Dogs–Hemp Calming Chews are veterinarian recommended and promote rest and relaxation for dogs. With thiamine, L-tryptophan, melatonin and other calming ingredients, the chews help dogs relax in situations that may cause them anxiety. In addition to other health benefits, hemp may produce unique anti-anxiety effects, and control generalized stress and obsessive behaviors, the company states. The chews are great for reducing anxiety caused by fireworks, thunderstorms, traveling, visits to the veterinarian, grooming and more. They have a 100% satisfaction guarantee.