A couple photos of Dunham exist online. The first one comes from Michael Barrier’s website and shows Dunham (right) with Tex Avery at Universal.
The second photo, from the Animation Guild blog, shows Dunham (left) at the infamous Snow White wrap party at the Norconian Club in Norco, California.
The description text in the YouTube videos offers an account of Dunham’s post-Disney career:
Jack later moved to Canada in 1955 by invitation of the Canadian Government to manage Associated Screen News (ASN) of Canada in Montreal. After his mandate at ASN Jack continued to live in Canada where he mainly produced animated and live action commercials in Montreal and Toronto, Canada. He was the original artist of Montreal’s famous St. Hubert BBQ Chicken cartoon character and produced their first television commercials among many others.
[In 2006] Jack and his wife Dorothy were evicted from their Montreal appartment and placed against their will under Quebec Government care. Because they were now homeless and his wife was highly dependent on alcohol they were locked up indefinitely in a psych wing of an all-French old age residence to prevent them from trying to escape. While in a wheelchair at 96 years old, Jack and his wife Dorothy (seventy years old) successfully planned and executed an escape to Ottawa by bus from Montreal where they were found by police in an Ottawa hotel a few days later and returned to the Montreal facility against their will. I just received word two weeks ago that he passed away [around March 15, 2009]. He was a real great guy with an incredible history spanning nearly a century. He never gave up hope and is finally free.