Countdown star Rachel Riley accompanied more than 140 dog lovers and their pets for the Great British Dog Walk at Osterley Park.
Actress Amanda Ryan also joined the party of pooches at the National Trust property on Sunday (June 7) for the fundraising event, organised by Hearing Dogs for Deaf People.
Rachel Riley officially started the walk, which was the eighth of 10 taking place across the UK to raise money for the charity to train more hearing dogs.
The maths whizz also took the lead of hearing dog Ginnie and volunteered for a demonstration by Cedar of the vital support such hounds provide their deaf owners.
"I loved taking part in the hearing dog demonstration to show everyone how these amazing dogs help deaf people by alerting to important sounds like the alarm clock and fire alarm," she said. "I wish I had a dog like Cedar to wake me up every morning.
"I hope we raised lots of money for Hearing Dogs so this amazing charity can train lots more clever, loveable pups to support deaf people."
As well as demonstrations throughout the day, there were also various stalls around the estate for dog walkers to browse.
Sarah Mohammedi, from Uxbridge, is one of many people across the country benefiting from the services of a hearing dog.
The 11-year-old contracted a viral infection at birth which resulted in severe deafness and learning difficulties.
Her deafness meant she struggled to communicate with her family and make friends at school, but her hearing dog Waffle has made a huge difference to her life.
The white cocker spaniel-cross-poodle has massively improved her confidence since the pair were united three years ago, according to the charity.
One of the biggest differences is the fact she now sleeps in her own bed, which she never did before, so her schoolwork is no longer affected by tiredness.