On a jaunt to his local green space, Little Wormwood Scrubs in Kensington, Fogle said he counted 100 dog turds.
Fogle has proposed a "pick up a poo" day to encourage more responsibility from dog owners. He also wants councils to be stricter on enforcing fines for people who fail to clean up after their dogs.
Fogle said the problem was so bad he no longer felt safe taking children out to play because his park was so dirty.
Meanwhile the dog sandpits near the entrance had never been used, as far as he was aware, and he had never seen a fine imposed.
Kensington and Chelsea insisted the authority ran campaigns across it parks, while Little Wormwood Scrubs was signposted and patrolled every day.
However the authority said: "While we do everything we can, this problem comes down to irresponsible dog ownership".
The Campaign for National Parks is a national charity that campaigns to protect and promote all of the national parks of England and Wales.