Possible Clues:

• Yokohama woofer
• Large mountain dog of northern Japan
• Spitz's kin
• Large spitz
• Large powerfully-built Japanese breed of dog
• Muscular Japanese canine
• Self-help group cuddling cat and dog
• Dog named after a Japanese prefecture
• Large dog walks in regularly with terriers
• Dog breed Helen Keller introduced to the U.S. in 1937