Pet Remedy Refill 40 ml Pet Remedy's unique combination of essential oils helps calm the nerves of anxious or stressed pets. It works by enhancing the production of GABA (gamma-aminobutyric acid), a natural chemical produced by the brain, which is transmitted from nerve to nerve as a calming message when the body is stressed. pet remedy is a low-concentration product based on a valerian and oil blend, which is very mild in its effect on the metabolism of any mammal, reptile or bird.