This is one happy dog!!
Interesting that so many Japanese are into dogs. Very much a middle class thing. The owners seem to lavish time and affection and care and certainly money on them.
All the dogs you've photographed look content and well looked after. This little canine looks well cared for and supremely satisfied with his doting owner and everything in his life.
(This from a cat person, so a true compliment.)
Your street photography never ceases to amaze and impress me. If I were I to try the same in Melbourne I would run a high risk of going home with a bloody nose, if not to the A&E at the nearest hospital.