Tuggo is a new one-of-a-kind dog toy that uses weight to provide tension for dogs.The design is a hard, hollow plastic ball with a rope going through the middle that can be pulled from either side providing the tug-of-war effect. Additionally, the Tuggo has a recessed screw cap allowing the ball to be filled with water. Adding water inside the ball makes the Tuggo have a sloshing sound when it is being played with. This keeps your dog interested in the Tuggo for hours! When completely full of water, the Tuggo weighs approximately 20 pounds. This weight provides the tension that helps promote exercise and build muscle.