Here's the official synopsis.
Quill, a Golden Labrador Retriever puppy so named because of the feather-shaped birthmark on his side, is sent to live with a couple, Isamu (Teruyuki Kagawa) and Mitsuko (Shinobu Terajima), who work as volunteers for the training of seeing eye guide dogs. Quill is subsequently taken to a professional guide dog school led by the friendly yet firm trainer Satoru Tawada (Kippei Shiina). Although Quill is a little slower than the other dogs at the school, he does exhibit a peerless level of devotion and patience for his trainers. Tawada decides that Quill would be the ideal guide dog for Mitsuru Watanabe (Kaoru Kobayashi), a lonely and ill-tempered elderly man who "would rather sleep than be dragged around by a dog." Letting his natural instincts guide him, Quill gradually helps his new master to open up and appreciate life. With time, Wanatabe learns not only to trust and enjoy the presence of other humans, but the dedicated animal at his side who guides him, as well.
'Quill' is out in limited release now and can also be seen on iTunes, Amazon and Vudu. The picture hits DVD on July 10th.