Retired racing greyhounds make wonderful pets!
None of that is true! In reality racing greyhounds wear muzzles as a state requirement for safety during racing on the track, and "all that energy" is because that are about to do what they were bred for - a quick sprint around the track. Unlike most sporting dogs, who were bred to be able to run all day, greyhounds are capable of expending enormous amounts of energy in a short few minutes; afte rthe race, it's back to the business of kennel life: a drink of water, a turn in the exercise pen, and a three-day rest before running again.
Greyhound history
From their beginnings, greyhounds have been bred to outrun their prey. Traditionally, they were walked on a lead until game was sighted and then they were released. From that moment on, they pitted their grace and intelligence against that of their quarry. The necessity of making their own hunting decisions has made them self-reliant and quick-witted. Lure-coursing and modern greyhound racing are controlled recreations of this chase. The prestige of owning the fastest running dog led gentlemen to race their dogs against each other. The owners and interested observers would bet on the outcome of the race. If, in the context of the race, a dog interfered in any way, it was put down immediately. Centuries of this type of genetic selection has bred out most aggression and led to the greyhound’s docile demeanor.