Police have launched an appeal to find Derbyshire trainer Owen Brennan.
Brennan, 77, suffers from memory loss and has been missing from his home on Wheeldon Avenue, Derby, since 4.45pm on Monday.
"Police are searching the area around his home and are now asking residents to check their gardens, garages and any other outbuildings for Mr Brennan," said a statement issued by Derbyshire Police on Tuesday afternoon.
"Mr Brennan is a horse trainer and police have not ruled out the possibility that he may visit racing events. They are asking people involved in horse racing to look out for him.
"Officers are becoming increasingly concerned for his safety as he has memory loss and the weather is cold.
"He is described as white, 5ft 7inches, of slim build, with brown short hair that is going grey.
"He is wearing brown denim trousers with a red cross on the back pocket, a brown cotton type jacket with a wool lining and a fur collar. He may possibly be wearing a cap. He walks with a stoop.
"Anyone who sees him should call Derbyshire police on 101."
Brennan's training career spans over 40 years and his best horses include Vulrory's Clown, Speaker Weatherill and Strath Royal, winner of the Charlie Hall Chase at Wetherby in 1998.
28 July 2014Beacon leads Hannon trio
Toormore on Goodwood mission
Options open for Approval
Star duo head Sussex field
Pallasator states case for Ebor
Custom a cut above
Harty doubles up in Galway feature
Munich Mission impossible
Jinx on a high in France
Cox plays it cool with Kodi
Girl given Lowther target
Burke looking to Curragh
Hanagan hails Taghrooda
Toormore drops in class for Lennox
27 July 2014Beacon shines over Molecomb rivals
Miss skips Galway for Goodwood
Tag crowned queen of Ascot
Muthmir delivers in Dash
Metal proves International star
Sheikh pounces for late score
Kingman poised for showdown
Kleo hits top gear for Cumani
Dettori strikes on Osaila
Bear grills Winkfield rivals
Yorkshire Oaks target for Volume
26 July 2014Taghrooda queen of Ascot
Elleval bids for Pomfret prize
Noble primed for German mission
O'Meara duo going International
Tag team happy to have a go
Telescope reaches for stars
Euro chasing dollar signs
Estimate given Goodwood entry
Pique Sous out for season
Secret chasing York success
Reason aiming to deliver in Dash
Remote on comeback trail
25 July 2014Hughes misses Newmarket rides
Bill seeks International acclaim
Tag team have a crack at George
Telescope has record in sights
Nicholls pays tribute to Business
Flintshire misses George date
Hills reveals positive test horse
Kennedy floored on Leopardstown bow
Candy sweet on hot-shot Alonsoa
Big guns in Irish Champion frame
Farraaj sidesteps York return
Classy entries for Champagne
Stars align for Sussex showdown
Kiyoshi dips in grade for Valiant
Gosden waits on Eagle call
Horsted heads International runners