According to Merriam-Webster, a Greyhound is 'any of a breed of tall slender graceful smooth-coated dogs characterized by swiftness and keen sight', as well as 'any of several related dogs,' such as the Italian Greyhound.It is a gentle and intelligent breed whose combination of long, powerful legs, deep chest, flexible spine and slim build allows it to reach average race speeds exceeding 64 kilometres per hour (40 mph). They do well in families with children, as long as the children are taught to treat the dog properly with politeness and appropriate respect. Greyhounds have a sensitive nature, and gentle commands work best as training methods.Occasionally, a Greyhound may bark; however, Greyhounds are generally not barkers, which is beneficial in suburban environments, and are usually as friendly to strangers as they are with their own families.A very common misconception regarding Greyhounds is that they are hyperactive. This is usually not the case with retired racing Greyhounds.