He frequently forgets he is a dog, and continues to try and act like a normal human despite his physical appearance. Using a pipe kept by his owners family, he can speak to Takeru to solve the mysteries for him. Sherdog continues to learn about the new world he lives in and adapts to the everyday life of being a dog. Takeru is a 16‑year‑old second year high school student who is an extreme dog lover. His entire family is made up of cops and detectives, making his meddling in crime scenes less questionable. After adopting Sherdog, Takeru takes the role as his dog's partner Watson and helps voice out Sherdog's discoveries to uncover the mystery. Takeru is a kind and compassionate young man who makes many connections with people but accidentally gets himself into strange situations. Kōsuke is Takeru's 48‑year‑old father who works as a police sergeant. He witnesses the naming of Sherdog and loves the puppy when he meets him. He makes important arrests of criminals when called out by Takeru to prevent danger to his son.

Airin is Takeru's 24‑year‑old sister and a detective in the Violent Crimes Division. She is known as an attractive woman and is thorough in her line of work. Takeru uses her as a way to get into crime scenes. Sherdog calls her Irene because she reminds him of his long lost love from 100 years ago. A big hint to her connection to Irene is when she (indirectly) serves Sherdog tea that she used to make for him when he was human. Miki is a 16‑year‑old who is Takeru's classmate in London Academy Highschool and is his current crush. She adores Sherdog and loves to spend time with Takeru. She is also a member of her highschool newspaper staff. When she is in trouble she turns to Takeru for help, showing she treasures him as a good friend.

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