Skeledog

Rex was initially an ordinary dog who was found by John and his family. John decided to adopt the homeless dog and named him Rex. One day John let Rex outside to roam free. Excited, Rex roamed parts of the city unsupervised and encountered Skeletor X. Rex was attacked by Skeletor X and mutated into a lesser skeletor that resembled a skeletal dog. Rex returned home to John who had to keep the dog's identity secret.

Powers
Skeledog has a very tough skeleton, similar to other skeletors. Skeledog also seems to have gained increased intelligence after the mutation. As a result of this he is smarter than the average dog. It is unknown if skeledog possesses any other powers and if he is able to use them.

Personality
Skeledog is fiercely loyal and stays by John's side most of the time. He sometimes accompanies him during crime fighting. Skeledog is also quite friendly towards strangers as long as they don't pose a threat.