Man’s Bizarre Transformation. How a Japanese Man Became a Dog


In 2022, the bizarre story of a Japanese man who spent over $100,000 on surgeries and costumes to transform himself into a Collie dog captivated the internet. The man, who goes by the name “Toko-san”, unveiled his dramatic physical transformation through social media, shocking many with his extreme body modifications to resemble a dog.

Videos and photos of Toko-san walking on all fours, interacting with actual canines, and sporting realistic dog-like features spread rapidly online earlier this year. His unconventional journey from human to “dog” prompted both curiosity and concern worldwide.

In this article, we will explore the motivations and methods behind Toko-san’s remarkable transition, examine expert analysis of his mental state, and consider the cultural backdrop behind this unprecedented case of species dysphoria. By looking at the various physical, psychological, and societal factors surrounding Toko-san’s decision to live as a dog, we can gain insight into the furthest extremes of human-animal identification.

Background on the Man

japanese man in dog costume walking on street on all fours

The man who transformed himself into a dog is a Japanese man named Toco. Prior to his transformation, Toco worked as an animal costume designer in Tokyo, Japan. He was known for being extremely passionate about his work and for his love of dogs, especially border collies.

According to an interview Toco did with Japanese media, he had dreamed of becoming a border collie since childhood. He was always obsessed with the agility and fluffy appearance of the breed. As an adult, he started actively researching ways he could transform into a dog. This research eventually led him to create the dog costume he now wears using his skills as an animal costume maker.

Friends described Toco as eccentric and highly dedicated to his craft. They weren’t surprised when he revealed his plan to become a dog, given his lifelong canine obsession. While they were supportive of his transformation, they admitted it was an extreme move on Toco’s part.

Initial Transformation

The story of the Japanese man who transformed into a dog first gained attention in 2022 when Toko, a man in his late 40s living in Saitama, Japan, revealed that he had spent 2 million yen (around $20,000 USD) on surgeries and procedures to become more dog-like (Source:

Toko’s transformation began in efforts to relieve severe stress from his sales job. He started wearing a dog costume, collar, and leash while walking on all fours. This made him feel relaxed and free. Over time, Toko pursued more permanent physical changes to become dog-like. In 2021, he had his teeth sharpened into fangs and underwent other body modification procedures. Toko also changed his name to “Toco” to complete his new dog identity.

man with surgically enhanced fangs to resemble dog teeth

The drastic physical transformation allowed Toko to fully embrace a dog’s lifestyle. In July 2022, he made his first public walk as a “human dog” in Tokyo, fully dressed in his costume with handlers. Toko expressed contentment living as a dog, feeling more liberated than his past human life.

Life as a Dog

After completing his transformation, the man known as Toco began living as a dog full time (1). He purchased an ultra-realistic collie costume and committed to staying in character. Toco discussed his experiences adjusting to life as a dog in several interviews. He reported having to re-learn basic skills like walking on four legs and wagging his tail. Toco also described the challenge of only being able to communicate through barks and dog-like gestures. However, he insisted that he was happy with his new canine existence.

According to Toco, living as a dog enabled him to see the world from a different perspective (2). He enjoyed heightened senses of smell and hearing compared to his human form. Toco also appreciated the unconditional love and acceptance he received from other dogs and animal lovers. Additionally, he found comfort in no longer needing to express complex human emotions or engage in high-level conversation. Despite some initial awkwardness, Toco grew to love drinking water from bowls, eating dog food, and going for regular walks. Overall, he embraced fully immersing himself in a dog’s lifestyle.



Scientific Explanations

There are a few scientific theories that could potentially explain this unusual transformation from man to dog. According to one source, Toco underwent extensive body modification surgery and procedures to take on canine physical characteristics ( This included facial reconstruction, teeth sharpening, ear reshaping, and fur implants across his body. Experts speculate that extensive plastic surgery combined with long-term behavioral conditioning could psychologically impact someone’s self-perception and identity.

Some scientists theorize that in very rare cases, a complex neurological condition could lead someone to truly believe they are an animal trapped in a human body. However, comprehensive medical examination would be required to confirm any underlying brain abnormalities. Mainstream medicine does not recognize the ability for a human to physically transform into an animal species.

Research into clinical lycanthropy, a delusional psychiatric syndrome where patients believe they can transform into an animal, may offer clues about this extraordinary case. There are also theories around dissociative identity disorders and the impact of trauma on self-perception that could potentially explain such a dramatic transformation of identity.

Return to Human Form

After living as a dog for several months, the man decided to return to his human form in November 2022. According to sources, he became tired of the challenges of living as a dog full-time [1]. He found it difficult to do basic human activities like going to restaurants and talking to people. Additionally, maintaining the dog persona publicly was emotionally and physically exhausting.

To return to his human form, the man ceased wearing the dog costume and make-up that turned him into a dog. He also stopped barking and acting like a dog in public. The process happened gradually over several weeks as he readjusted to living as a human again. Though he still maintains an interest in dogs and enjoys elements of dog culture, he felt it was time to leave behind the extreme commitment to living fully as a dog.

Psychological Impact

The man’s transformation into a dog likely had profound psychological effects, both during the time he was physically a dog and after he returned to human form. According to a 2022 study published in Nature, the strong bond between dogs and their owners can provide emotional support and companionship, but also negatively impact mental health in some ways (

psychological impact of living as human-dog hybrid

While in dog form, the man may have experienced reduced stress, anxiety, and loneliness thanks to positive interactions with humans. However, his mental faculties and identity as a human were likely diminished. Confusion, fear, and depression could have resulted from losing his humanity and voice. After reverting to human, he probably grappled with the trauma of those experiences. Feelings of dehumanization, powerlessness, and disconnection from society may have lingered.

Additionally, after rejoining human civilization, he may have longed for the unconditional love and simplicity of life as a dog. Having to readjust and make sense of his dual identities could have been an emotionally difficult process. Overall, the transformation seems to have amplified both the benefits and downsides of the human-dog bond. With proper counseling, the man may have been able to achieve better psychological wellbeing in the long run.

Societal Reactions

Society had mixed reactions to the Japanese man’s story of turning into a dog. Many people were skeptical and didn’t believe his claims. Some thought he made up the story for attention or profit (cite: Others saw it as a reflection of mental illness or instability caused by trauma from his time in the internment camps during WWII (cite:

Some more open-minded people were intrigued by the story and saw it as a chance to learn more about the human mind and capabilities. Scientists and psychologists took interest in studying the man to understand how such a transformation could occur (cite:

Overall, the story challenged many societal assumptions about what is possible for human beings. While some dismissed the man’s claims, others saw it as an opportunity for learning, growth and open-mindedness. The range of reactions illustrated the complexity of how society comes to terms with extraordinary stories that seem to defy conventional wisdom.

Lessons Learned

Toco’s experience provides some interesting lessons and insights. According to an interview with Newsweek Japan (, Toco says the most difficult part of living as a dog was the limitation on verbal communication. He could not speak directly to people to express his thoughts and feelings. This left him feeling isolated at times.

The experience also gave Toco a deeper appreciation for non-verbal communication. As he took on canine mannerisms, he realized how much could be conveyed through body language, sounds, and facial expressions. Developing this non-verbal fluency helped him connect with people in new ways as a dog.

On a societal level, Toco’s story sparks discussion about how we define humanity. If a person genuinely identifies as a dog on the inside, should we embrace that or view it as a disorder? Toco’s experience asks us to reflect on what truly makes someone human.

examining the essence of humanity and identity

Overall, living as a dog made Toco more attuned to the present moment. Freed from words and abstractions, he focused on sensory experiences like smells, touch, and food. This simpler way of being gave him a sense of liberation from many anxieties of human life.


The sensational case of the Japanese man who turned himself into a dog captivated the world’s imagination and challenged our understanding of identity. While the physical transformation was extreme, requiring surgery and other procedures totaling over $20,000, the psychological motivations behind it raise deeper questions. At his core, the man known as Toco felt he was truly a dog inside and took dramatic steps to align his outer appearance with his inner sense of self. Much is still unknown about what drove these feelings and his underlying mental state. His public outings, first walks on the street, and videos give us a glimpse into his new life as a human dog hybrid. Reactions ranged from fascination to condemnation over his choices. In the end, his story prompts us to reflect on what it means to find fulfillment in life through radically altering one’s identity and what boundaries, if any, society can justly impose on such individual liberties.

Scroll to Top