What did thoreau have in common with John Thornton in call of the wild

They both found enjoyment in solitude

Contrary to popular believe, introverted nature is not all about cant make friends and Social anxiety. Introverts just have a huge tendency to be stuck in their own mind for a longer period time. Thoreau and John thronton is just like that.

They both find pleasures in escaping soceity's petty attempt to communicate (such as gossip, small talk, etc)