Yes, you can wash KONG balls to keep them clean and hygienic for your dog. The specific washing instructions may vary depending on the material of the ball, so it's always a good idea to refer to the packaging or manufacturer's recommendations for the particular KONG ball you have. Fill a sink or basin with warm water and add a small amount of mild soap or dog-safe detergent. Immerse the KONG ball in soapy water and use a sponge, brush, or cloth to scrub the surface of the ball. Pay attention to any grooves or textured areas that may require extra cleaning. After scrubbing, rinse the ball thoroughly with clean water to remove any soap residue. Allow the KONG ball to air dry completely before giving it back to your dog. Placing it in a well-ventilated area or outdoors can help speed up the drying process.