These 16 oz. hydration bottles come complete with screw-top lids that allow quick access to cool water and/or electrolytes for your dogs. They are a perfect match for our K9 Hydration Tabs VF which require 16 ounces of water to make an electrolyte rich solution. Squirts in a long stream to easily get fluids down your dog's throat quickly. Small mouth opening to remind you to break hydration tab in two to quicken mixing time. Refillable and reusable time and time again.