Fics like Instinct

Dean was trained to fight. He was one the strongest and fiercest dogs out there, claiming victory without mercy. That is, until the trainers want Dean to fight against his littermate, Sam. Dean refuses, and as a result he is turned into a bait dog. Dean is rescued from this Hell and taken to a home, but only after being mentally and emotionally scarred. The twolegs think him broken, and they're not far off. However, Castiel, a therapy dog, sees a something in Dean that others cannot. He intends to heal Dean, the only question being whether or not Dean will let him. In which Dean is a dog rescued from a fighting rink, and Castiel is a dog that leads him back to living.

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