KONG Extreme Ball This very resistant natural rubber ball does not break so easily! It is ideal for dogs addicted to playing with balls, both chasing and nibbling on them. The KONG Extreme Ball has a hole through which you can introduce the treats that your dog likes the most, in this way the fun will be much more exciting. Size recommendation according to the manufacturer: Size S: 6 cm in diameter approx., for dogs up to 16 kg Size M/L: 7.5 cm in diameter approx., for dogs up to 30 kg Warning: As with any other item, keep an eye on your dog while it plays. Check the product periodically and make sure that it is not defective or deteriorated. If so, replace or discard this toy. Otherwise, your dog could swallow a piece and suffer possible injuries or discomfort.