janitor discovers a suspicious card box with a message written on it that changes his life for good

Haven

Even though the shelter was heaven for Snowflake, the teacher did feel a shade of regret on not being able to keep him. She was a single mother and so had all responsibilities of her kid along with the dogs. She was well aware that even though she adopts Snowflake she might not be able to give him enough attention. So, giving him to a shelter was the only way out for her.