Shadow is a Malamute dog and partner to GCPD officer, Jack Slate. Shadow is extremely loyal to Jack until the very end and will obey any commands his master gives him. While playing as Jack with Shadow by his side, Jack can command Shadow to attack enemies. Shadow can do silent kills from behind, turning the enemy around and ripping out their throats or biting them in the throat, or if you wanna run in and be brave you can charge in and use his signature scrotality takedown in which he bites a male enemy in the testicles and finishes them off by tearing out their throats. When sneaking, Shadow can also sense an enemy's heartbeat. Enemies glowing blue are calm, and when they glow yellow, they can sense something is there and when they glow red, they know that Shadow is there and will fire at him. When commanding Shadow to attack, the nearest enemy will glow red and Shadow will attack. When sprinting at full speed, Shadow can bowl over enemies and finish them off by shaking them to death. Jack can also tell Shadow to fetch weapons for him.
According to Frank (Jack's father), he found Shadow chained up in an alley when he was a puppy. Frank managed to bring Shadow back to health and signed him up for K-9, but they failed him out because they thought he would be too "feral" and wanted to put him down. Frank however disagreed and he decided to use Shadow for the 87th Precinct of Grant City and ever since then Shadow has helped Frank and Jack apprehend criminals. It is believed that Frank was more of Shadow's owner and, according to Frank, Shadow saved his life more times than he can count. After Frank was killed, Shadow moved on to be Jack's partner. After arriving on Danver's Island, Redwater was about to kill Jack with a turret until Shadow attacked Redwater, saving Jack but was injured by Redwater. After defeating Redwater, Shadow came up to Jack limping and Jack said that he finally earned his wings and also said "And just for the record... thanks." Shadow also accompanied Jack at Frank's funeral.