That exactly how it went with Joe. I did have to teach him not to get grumbly when I take stuff away, but it was a ten minute lesson. He's learned a lot, and so have we, but his general attitude has stayed the same.
Brees, on the other hand, totally tricked us. She was passive and a little shy at the kennel, but walked into the house, saw the stuffies and didn't stop playing for about three hours. Then she fell over, exhausted. I had to play stuffy toss every morning for a loooooong time before I was "allowed" to drink coffee. She was shy with strangers for the first year, but has pretty much gotten over it and learned that people pet her. She's still nuts with toys, but she's turning into a real greyhound. She's learning to love sleep, and doesn't want to get up in the morning until she thinks some people food or a walk will be coming. Brees was a good dog when we got her, and she gets better every day.