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.
20 September 2014That could tackle fences this year
Bell saddened by Wigmore article
Limato out of Mill Reef
Horse welfare 'priority' - BHA
Four-timer for magical McCoy
Accipiter comes good for Wall
Hawk leads treble swoop for Hughes
Bamford wants a Gold Watch
Ainippe samples joy of six at Ayr
Goldie pair on Gold run
Angel of the north heads to Newbury
Candy issues Limato Reef advisory
Glorious bids to protect Legacy
19 September 2014Perfect return for Maguire
Rebel has a cause at Listowel
Ryan quartet in Ayr raid
Varian swoops for Marshall
Simcock aims high with star duo
Bolster back on Gold trail
Fahey chasing Newmarket Millions
Time called on Dude career
Makin off to a flyer at Ayr
Festival stalwart Celestial retired
Guest banking on Memory at Ayr
Dettori sweet on World rule
Baraweez on track for Ascot
Maguire raring to go
Watchable handed low Gold draw
Palmer mulls Aktabantay options
Bronze seeking Newmarket gold
18 September 2014Breathing operation for Cue Card
Early conclusion to Levy agreement
Johnson Houghton hearing date set
Walker looks to future with Moon
Red-hot Kirby in Sandown treble
Listed honours for Hadaatha
Busy bags another National
Botti lines up Newmarket raid
Vintage performance from Weld filly
Cup dreams in mind for Forever
Weld prepares Newmarket challenge
McGrath and Walton charged by BHA
Encke camp ponder next move
17 September 2014Street Cry dies, aged 16
Luck be a Lady in Cheveley Park
Appleby won't Abandon hope
Glenalmond disrupted by setback
Judgement day looms for Benoist
Toocool in Mill Reef frame
Time out for Panama
Adelaide backed to shine in Plate
Ascot to offer Irish incentive
Ryan advises caution on Gatsby run
Goodwood work forces race changes
Cosgrave hits out at ERA decision
Twilight takes Thirsk triumph
Ayr hero Ramius set to retire
Sea The Moon forced to retire
Lantern shines in morning spin
Simcock maps out plan for star pair
Max powered up for Abbaye