The PROCYON egg toy is similar in principle to the Treibball game. It is very large in size so that the dog cannot carry it in its mouth, but rather pushes or rolls it. However, unlike the regular Treibball game, the egg does not simply roll forward, but changes direction unexpectedly due to its oval shape. Therefore, it is suitable for more advanced players who are skilled in handling the Treibball game. The egg is made of hard plastic, and thus is not easily damaged by attempts to bite it.