3D Desktop Dogs Screensaver for Mac

From Useless Creations:

They run around leaving footprints all over your desktop, or any other image you like! Features Include: Dozens of cute, cartoonish, truly 3D, puppy dogs! The full version includes 5 different dog models, with 25 colors/fur patterns each! That's over 100 different dogs for you to watch dirty up your desktop! All the fun of a puppy dog, with none of the mess! As the puppy dogs wander about your screen they leave footprints! They also scratch, sleep, sniff, and do... other things that dogs do! Bad dog! Use any image you like! The dogs will walk around the screen you were just working on, or you can set them to walk about your desktop background, wallpaper, or any other image you like.

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