Possible Clues:

• Breed featured in 2009's "Hachi: A Dog's Tale"
• Dog named for a Honshu district
• Breed in 'Hachi: A Dog's Tale'
• Large powerful Japanese breed of dog
• Japanese city that shares its name with a dog breed
• Large dog walks in regularly with terriers
• Dog breed that was an integral part of Samurai culture
• Spitz breed with catlike feet
• Muscular Japanese breed
• Canine from Japan