Ex-marine Bill Lockwood, 86, is used to challenges.
So taking on the Muddy Dog Challenge for Battersea Dogs and Cats Home should be a piece of cake.
Mr Lockwood, who lives in Ascot, will undertake the 2.5km obstacle course at Windsor Great Park on Saturday, May 20 with his partner in crime Snoopy - a cross breed of dachshund and shih tzu.
He has already raised more than £500 in sponsorship for the animal welfare charity which has a rescue centre in Old Windsor.
To prepare for the challenge Mr Lockwood has been undertaking long walks daily with Snoopy to build up his stamina.
Diving through Muddy Mayhem and zigzagging Into the Woods are just some of the obstacles Bill and Snoopy can expect to tackle as they take part in the muddy dog challenge - England’s first obstacle course where runners can take part with their furry friends while raising vital funds for rescue dogs and cats.
The event, which takes place in Windsor Great Park allows participants to take on a 2.5km or 5km course, either alone or alongside their keen canines. There are 17 different mud-drenched obstacles for runners and their four-legged-friends to crawl, jump, climb, slide and wade through.
Mr Lockwood has been inspired to take on the challenge by his daughter Charlotte Fielder, Head of Volunteering and Fostering at Battersea (pictured with her dad and mum Patti).
He said: “I’ve had three Battersea dogs over the years who have bought so much joy to my family and friends, so raising money for the home means a lot to me. I last volunteered for the Royal Marines in 1948, so at 86 I thought it was about time I volunteered again. Obstacles don’t faze me, I’m just hoping the mud isn’t too cold."