Jay Williams, author of Author Under Sail: The Imagination of Jack London, 1893-1902,  recently announced to the Jack London listserv that the Huntington Library is in the process of digitizing the contents of London’s photograph albums:

http://hdl.huntington.org/cdm/landingpage/collection/p16003coll7

Among the photographs available there are this one picturing the Bond brothers at their cabin with “Jack,” the dog that inspired the character of Buck in The Call of the Wild.