Sonic the Werehog is a transformation that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is a transformation of Sonic the Hedgehog that he could achieve while struck with an unknown ailment.
In this form, Sonic resembles a werewolf and gains more muscle mass and weight. He grows slightly larger, with a broader torso, a longer muzzle, larger hands, and longer, more muscular arms. Additionally, his finger nails become claw-like and his teeth become fangs. Likewise, his ears become more curved and thin. His once peach skin is now a pale blue. His fur grows into a lush, heavy, dark blue coat. Traits of white fur also appear on his wrists.
For attire, Sonic loses his white gloves, exposing his hands, and his socks becomes slightly frilled. He also he retains his sneakers in some shape and form.
During the time the world was broken apart by Dr. Eggman's Chaos Energy Cannon, Sonic came down with an illness that caused him to transform into Sonic the Werehog. However, he eventually rid himself of that condition.