In both of those games, when the DMs said that they were allowing not only cohorts but followers into the arena/dungeon, I thought to myself, "what are they thinking?" But far be it from me to pass up an opportunity to eke a little more out of a feat.
In the dungeon game of death, my cohort even had an animal companion. Little known fact, the Dire Tiger was supposed to be named Stryper, but clockworkjoe demanded that in order for him to allow the Dire Tiger in the game, it had to be named Mr. Boots.