well done for rescueing the greyhound just keep talkiing and fussing him don,t worry about the walks just yet let him get used to his new home and garden for the first few days i have had them like that it just takes a bit of time it is very rewarding in the end when they do come round you have saved his life some pine away in kennels ,is he eating ok ,if you need any more help send me pm or email address i,ve had lots of experience with greyhounds we used to race them a few years ago so any help you need just get intouch