Blade Wolf

Blade Wolf is a robotic wolf who was originally a servant of Discord, but is now an ally of the survivors.

Backstory
Blade Wolf was created by Discord to kill Moomin, Rick Grimes and all their friends. He is first seen in the season 2 episode "Chupacabra". During their first encounter with him, the survivors ask him what good is an intellect if he can't use it. To which Blade Wolf replies "I may analyze orders but I may not disobey them. Should I disobey a direct order, my memory would be wiped."

In the next episode, "Secrets", Blade Wolf attacks again, with help from a mob of walkers. However, the survivors manage to fight the walkers and Blade Wolf off. Blade Wolf tells them that he's following Discord's orders because he has no freedom.

Blade Wolf makes his final season 2 appearance in "Pretty Much Dead Already", where he kills Sniff, only for Raiden to slice him to ribbons.

In season 3, Raiden and Snork agree to rebuild Blade Wolf so that he can have the freedom he wanted. He also happily joins the survivors because they gave him his freedom.

Trivia

 * Blade Wolf is voiced by Michael Beattie