Carr & Day & Martin Gallop Medicated Shampoo. Carr & Day & Martin Gallop Medicated Shampoo is a deep cleaning, medicated shampoo that is ideal for dry, flaky, scurfy and sensitive skin. Gallop Medicated Shampoo offers a pH neutral formula, can help calm and soothe irritated, sore and damaged skin, and contains both antibacterial agents and natural oils that help to soften and lift scabs and dandruff. Gallop Medicated Shampoo contains added coat conditioners for a softer and shinier coat and can also be used to help combat skin complaints, like mud fever. Gallop Medicated Shampoo can be left on the skin for approximately 5 minutes when treating skin complaints to allow the antibacterial and soothing agents to cleanse deeper.