If a greyhound wont chase the lure and give 100%, then he is not much good for the track, so a good home is found. One of the reasons is he knows its just a piece of tin, its not the real thing. Try taking him lamping.
i reared a litter a few years back and they all went well bar one bitch when started at trails,this bitch was a brute at 32inches at the shoulder so i took her out on the lamp and she flew and caught 2 rabbits on her first night out,took her back for a trail and she went half way round jumped the rail and came back to me any way i took her home and over the next year she was