I agree with desiree if the dog has not been out of rescue for at LEAST 6months than NO to staying with a trainer. Also [color=red](others feel free to jump in)[/color] That greyhounds are a highstrung breed and if I am not mistaken Weimaraner's have some issues of their own ?? I would try a trainer who has sessions with other dogs so he can see the way your dog reacts around other dogs. Do you have any experience with dogs at all? How much excerise does he get?