"Inu o Kau" centers on Satoru, a young man who adopts a stray dog named Pochi after a chance encounter. The narrative explores their evolving relationship as Satoru navigates the responsibilities and challenges of pet ownership. Pochi, initially wary and untrained, gradually becomes a loyal companion, while Satoru learns to balance his personal life with the demands of caring for a pet. The story delves into themes of companionship, personal growth, and the emotional bond between humans and animals.

The manga also introduces supporting characters who influence Satoru’s journey, including his coworkers, friends, and fellow dog owners. These interactions provide insight into the broader community of pet lovers and the shared experiences of raising animals. The plot occasionally shifts focus to Pochi’s perspective, offering a glimpse into the dog’s thoughts and emotions, which adds depth to the narrative.

As the story progresses, Satoru faces various challenges, such as training Pochi, dealing with health issues, and addressing behavioral problems. These struggles are portrayed realistically, highlighting the dedication required to care for a pet. The manga also touches on societal attitudes toward stray animals and the importance of responsible pet ownership.

The tone of "Inu o Kau" is heartfelt and grounded, emphasizing the everyday joys and difficulties of life with a dog. The relationship between Satoru and Pochi serves as the emotional core of the series, illustrating how their bond transforms both their lives. Through its focus on the human-animal connection, the manga offers a relatable and poignant exploration of love, responsibility, and mutual understanding.