Greyhound racing
Greyhound racing is the sport of racing greyhounds. The dogs chase a lure (traditionally an artificial hare or rabbit) on a track until they arrive at the finish line. The one that arrives first is the winner.
In many countries, greyhound racing is purely amateur and conducted for enjoyment. In other countries (particularly the UK, US, Ireland and Australia), greyhound racing is a popular form of gambling, similar to horse racing. There is some popular concern in the aforementioned countries regarding the well-being of the dogs; the effectiveness of industry efforts to address these concerns is controversial. A greyhound adoption movement has arisen to assist retired racing dogs in finding homes as pets.

Hare coursing
Hare coursing is the pursuit of hares with greyhounds and other sighthounds, which chase the hare by sight and not by scent. It is a competitive sport, in which dogs are tested on their ability to run, overtake and turn a hare, rather than a form of hunting aiming at the capture of game. It has a number of variations in its rules around the world. Informal coursing can be a true form of hunting. It is often conducted to kill game or vermin, mainly for food, and occasionally as a form of gambling.
Coursing is a long established and almost universal hunting technique, practiced historically with greyhounds, other sighthound breeds, or with lurchers which are crossbred sighthounds, and working breeds. The sport grew in popularity in Europe during the 19th century, but has since experienced a decline due in part to the introduction of greyhound racing and betting.
In recent decades some controversy has developed around hare coursing, with some viewing it as a cruel bloodsport and others seeing it as a traditional activity that assists in the conservation of hares and tests the ability of sighthounds. Since 2005, hare coursing has been banned in the UK but continues elsewhere in the world as a regulated and judged, competitive sport, especially in Ireland and Spain, as well as in Russia and the Western United States. Elsewhere, in Eurasia for example, coursing continues as a classic form of hunting.

Lure coursing
Lure coursing is a sport for dogs that involves chasing a mechanically operated lure. Competition is usually limited to dogs of purebred sighthound breeds.
Lure coursing Video

Weiner Racing
Dachshund racing, or wiener dog racing, is a popular, yet controversial sporting event, primarily found in North America. Typical Dachshund races are either 25 or 50 yards in length, and are run on various surfaces. Many race tracks across America host these events as fundraising or publicity events, and routinely draw the venues' largest attendance numbers of the year.
In the less formal events, most entrants are not career racers, nor bred for racing. Often, dogs will choose not to run the length of the course and instead visit with other dogs or the owner that released them. Otherwise, dogs will run swiftly to their owner at the finish line, coaxed by food or toys.
The de facto national championship of wiener dog racing is the Wienerschnitzel Wiener Nationals, held in San Diego, California every December as part of the Holiday Bowl, however there are many other venues that claim title to the true "national champion".
Weiner Racing Video