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Some would call him barking mad. Others might praise his dogged determination. But one thing is certain - in the world of photography, Chris Porsz is top dog when it comes to pooch portraits.
So dedicated is he to his craft, he has spent 40 years travelling the world to capture the best images for his latest book.
And even went to Barking.
While some of his images are the result of careful composition, others have been about luck - and being in the right place at the right time.
Chris, who lives in Cambridgeshire, says he was inspired to pick up his camera again after a hiatus by the American photographer Elliot Erwitt and recreated his woman-dog image as a tribute.
The photographer says he is fascinated by the relationship between dogs and their owners - but is often so captivated by the animal, he'll cut out the human altogether.