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The short answer is yes, they certainly can. When performing strenuous exercise, especially on hot, humid days, racehorses may be pushed beyond the limits of their recovery mechanisms and suffer incidents of overheating. Otherwise known as extertional heat illness, heat stress or hyperthermia, overheating typically occurs immediately post-race and is characterised by obvious signs of distress, elevated heart and respiration rates and profuse sweating.

In extreme cases, overheating can put horses into a state of medical shock, such that their organs and cells, including muscle cells, stop functioning properly. Symptoms may include unpredictable behaviour and gait, stumbling, collapse and convulsion, but medical shock is a life-threatening condition, so racehorses with serious overheating should always be considered a veterinary emergency.

Sweating is a much less effective cooling mechanism in horses than in human beings, such that during the Summer – or, indeed, during unseasonably warm weather at other times of year – racecourses take precautions to prevent heat-related problems in horses. Such precautions include the provision of plentiful, easily accessible water supplies, for washing down and drinking, in all horse areas and, if possible, additional shaded cooling areas, available pre- and post-race. Indeed, many British racecourses have also installed high-pressure misting fans, which draw heat from the surrounding air and allow horses to cool more quickly during washing down.

The British Horseracing Authority (BHA) is unfraid to abandon racing altogether, on welfare grounds, if temperatures are deemed unsafe. In July 2022, for example, the BHA abandoned five fixtures, at Beverley, Windsor, Chelmsford, Southwell and Wolverhampton, after an extreme heat warning was issued by the Met Office.

In short, Aintree racecourse. As the home of the world famous Grand National, Aintree Racecourse, on the outskirts of Liverpool, requires little introduction. Despite a raft to changes to the course, entry criteria and so on in recent years, the Grand National remains a tough, but fair, challenge for horse and rider and attracts an estimated audience of 800 million worldwide.

The Grand National circuit is a flat, left-handed triangle, two and a quarter miles in extent and featuring 16 distinctive, spruce-topped fences. Nowadays, the Grand National is run over a distance of four miles and two and a half furlongs, but must still negotiate 14 fences – including formidable obstacles such as Becher’s Brook, the Canal Turn, and the Chair – twice, before setting off up the infamously long run-in.

The Grand National is, in fact, just one of five races run over the National fences during the season. The other four are the Foxhunters’ Open Hunters’ Chase and Topham Chase, which are run during the three-day Grand National Festival, and the Becher Chase and Grand Sefton Chase, which are run on the same day in December.

Inside the Grand National circuit, the Mildmay Course is a similarly flat, but much shorter, at one mile and three furlongs in extent and is characterised by its sharpness. The fences, while stiffer than they once were, are of the conventional birch variety. Seasonal highlights on the Mildmay Course include the Old Roan Chase, in early November, and the Aintree Bowl and the Melling Chase, in early April.

Affectionately known as ‘Headquarters’, Newmarket Racecourse, in Suffolk, is a world-famous sporting venue with a long, illustrious history dating back over three and a half centuries. Indeed, it was the ‘Merry Monarch, King Charles II who, in 1666, established the King’s Plate, which still exists as the Newmarket Town Plate, on the original Round Course. Nowadays, part of the Round Course is used just once a year for that historic race, but Newmarket is also home to two much better-known courses, the Rowley Mile and the July Course.

Notwithstanding the undulations in the first six furlongs of the straight Bunbury Mile, on the July Course, and the last two furlongs of the Rowley Mile, which run downhill and then up again to form the so-called ‘Dip’, both courses are essentially galloping in nature. In both cases, the uphill climb from the furlong marker to the winning post exposes any stamina frailties, particulary in those who commit for home too soon.

On the Rowley Mile, the principal meetings are the Craven Meeting in April, the Guineas Festival in May, the Cambridgeshire Meeting in September and the Future Champions Festival in October. Aside from the first two Classics of the season, the 1,000 Guineas and 2,000 Guineas, the Rowley Mile hosts the Cheveley Park Stakes, Middle Park Stakes, Sun Chariot Stakes Dewhurst Stakes and the Fillies’ Mile in the autumn, not to mention two major ‘Haritage’ handicaps in the form of the Cambridgeshire and Cesarewitch. On the July Course, the July Meeting features the July Cup, Falmouth Stakes and Bunbury Cup.

Like the Grand National itself, the Becher Chase is what the British Horseracing Authority (BHA) now terms a ‘Premier Handicap’ run over the iconic Grand National fences at Aintree. Indeed, like the sixth obstacle on the Grand National Course, Becher’s Brook, the race is named after pioneering steeplechase jockey Martin William Becher.

However, the Becher Chase is run in early December, as opposed to late March or early April, and over a distance of approximately three miles and two furlongs, as opposed to approximately four miles and two-and-a-half furlongs. In fact, the race starts after the ninth obstacle on the Grand National Course, Valentine’s Brook, so runners cover a circuit-and-a-half and must negotiate 21 fences, rather than two full circuits and 30 fences.

Proven course form is not a prerequisite to winning the Grand National but, like the other early-season race over the Grand National fences, the Grand Sefton Chase, the Becher Chase remains open to horses aged six years and upwards. The Becher Chase is often used by trainers to provide a ‘sighter’ over idiosyncratic fences ahead of the Grand National the following April, or in susbequent years.

Two horses have won the Becher Chase and the Grand National, but neither did so in the same season. Earth Summit, trained by Nigel Twiston-Davies, actually won the Gradn National first, in April 1998, before returning to Aintree to win the Becher Chase the following November. Amberleigh House, trained by the legendary Donald ‘Ginger’ McCain, won the Becher Chase in November 2001 and the Grand National, as a twelve-year-old, in April 2004.