John Unger, his 19-year-old dog, arthritis. 他19歲的狗,關節炎。

photographer Hannah Stonehouse Hudson
Pictured: The heart-melting moment when a man lulls his arthritic dog to sleep in a lake | Mail Online http://www.dailymail.co.uk/news/article-2186373/Pictured-The-heart-melting-moment-man-lulls-arthritic-dog-sleep-lake.html?ICO=most_read_module
Photographer Captures Tender Moment Between Man And His Sick Dog In Lake Superior (PHOTO) http://www.huffingtonpost.com/2012/08/08/man-dog-lake-superior-photo-_n_1755609.html
Heartwarming Photo of a Man and His Dog Has Facebook Users Smiling
http://mashable.com/2012/08/08/man-dog-viral-facebook-photo/

Dog - Wikipedia, the free encyclopedia
 the age at which half the dogs in a population have died and half are still alive, ranges from 10 to 13 years Individual dogs may live well beyond the median of their breed.
http://en.wikipedia.org/wiki/Dog
犬 - 维基百科,自由的百科全书
亦稱狗,其壽命約十多年,與貓的平均壽命相近。若無發生意外,平均壽命以小型犬為長。
http://zh.wikipedia.org/wiki/%E7%8A%AC