Shires Ezi-Groom Neem Shampoo. Give your horse or pony a soothing bath with the Ezi-Groom Neem Shampoo. Perfect for use in the spring or summer months, the Neem Shampoo contains concentrated neem oil which provides natural anti-fungal and antibacterial properties. Neem oil has been traditionally used for lice, flies and other parasites in livestock. Ezi-Groom Shampoo also features added coconut oil to help add condition to the hair whilst encouraging the repair of dry or damaged skin and hair.