Cogster (or Cogsta to Prof. Thaddeus J. Pinchworm) is the hench-robodog from the "Birthday World" episode of The Wacky Adventures of Ronald McDonald.


Cogster first comes out of the drawer when called by Pinchworm to fetch Ronald and his friends, only to get pummeled by an active ride hippo. When he caught up at last, Ronald used his wits and magic to turn a metal bar into a metallic doggy bone, causing Cogster to fetch and keep it.

He later appears near the end chasing the defeated Pinchworm after assuming that he was another metallic doggy bone.