This is the fastest Sluggy variant and the second-strongest stat-wise. In earlier stages, he can be easily dealt with by any cat, but in later stages he gets harder, acting as an annoying support for stronger enemies.
Turn the animation on and off using the switch in the upper left. Clicking the viewer background enables scrolling and zooming with the mouse if on desktop. Note that browser zoom may cause issues with scrolling and zooming. A list of available backgrounds can be found here. For more info on usage, see here.