My step-sister was one of the first female dog handlers at the track in Seabrook, NH. (I think it was Seabrook, anyway, somewhere drivable from Boston but not actually in MA.) She brought one of the puppies home to her family before her folks were divorced. Later when my mom married her dad, I sort of inherited care of the dog, because I was the youngest kid at home.
I had a great experience with that dog. He was so good natured and loved people. He never bit anyone, but he had a mannerism we called "smiling" where he would pull his lips back from his teeth when he was excited about something. It looked enough like a growl to scare off the marginal people. He also used to "pray" when he wanted something; he would stretch out his front paws but keep his butt high, like a cat when you scratch his tail, and he'd give us the most beseeching look! He slept in my bed with me, we took him camping, I have photos of him dressed up in my step-brother's ski gear. He loved to run in figure-8's (no wonder he never won on an oval track! lol) and would jump for pizza and was afraid of my hamster. Oh, and his bones were so long, that he'd always lay in walkways through the house, because he needed the leg room! He was quite a character, which is one of the things I liked.
I'm sure some dogs are not as pleasant as ours was, but I haven't yet met a grumpy gryehound. If I was going to get a dog, I'd get another greyhound in a minute. Lovely animals. Enjoyable pet.