H2O4K9 K9 UNIT Insulated Dog Water Bottle Twist top lid has no hinges or complex parts that can break or rust and allows you to pour any unused water back into the bottle, preserving water Patented BPA-free large capacity lid with wider, deeper drinking trough, allows your dog to drink naturally Rugged outer shell is self insulating, impact resistant and sound dampening; built for easy grip & quiet use