Ruffs is a large dog-like machine. Instead of eyes, he has a goggle-like sensor that continuously senses vibrations on the ground and shows them on a line. His only way of speaking is to say "Bow Wow" in a monotone, but loud voice. His voice is always followed by two loud clicks.
He favors biting attacks, though he has shown a few electrical powers as well. He has not been seen since War of the Worlds.
Ruffs is fought alongside K.Rool in Robo Cave. Because of this, his HP is only 1,450.