The size of the dog bouncy ball is measured by hand horizontally, and there may be an error of 1 ~ 3cm. Please pay attention to and consider this factor when purchasing dear friends! All dog toy ball's pictures are taken in kind. Due to the difference in lighting and display, there may be a color difference between the real dog balls. This kind of problem is not a product quality problem. The moving dog ball is very welcomed among dog owners! Don't hesitate to buy!