Mouser (Mirage)

The Mousers are robots created by Dr. Baxter Stockman and through this affiliation enemies of the Turtles. The robots are about knee high. They have a head with sharp teeth and two legs. Their jaws are strong enough to bite through steel.

Mirage Comics
In the Mirage Comics the Mousers were originally created by Dr. Baxter Stockman, under the premise of selling them to the government, to help fight New York City's Rat problem. However, their creator Baxter Stockman, used them to steal valuables, from bank vaults after his assistant April O'Neil accidentally stumbled on his true intent, to gain billions through crime as he believed himself to be smarter than the authorities.

After April escaped from a secret lab in Baxter's complex and into the sewers she was eventually cornered by several mousers. At the last second the Turtles burst from the shadows and destroyed all the mousers she promptly fainted after the turtles showed themselves to her. After waking up in the Lair and after calming down from the Sight from the Turtles and Master Splinter, she was told of their origins, after that a TV news Bulletin Came on showing a shadowy figure threatening to destroy a building unless he was paid a ransom. The ransom wasn't paid and the building was destroyed, April Instantly sussed out that Stockman was responsible and lead the turtles to the underground lab and tried to help the turtles shut the mousers down. While Leonardo, Raphael and Michaelangelo fought a horde of Mousers off she and Donatello Initiated an Emergency shutdown, It worked and the turtles and April departed from the lab.

Each Mouser was about 60 cm Tall, could hold up to five Rats and were controlled by radio waves and were controlled by a central computer.