I'm a great believer in the old addage "you only get out what you put in" ! This probably comes from my Whippet and Greyhound days; but I think it applies more to Lurchers, if you are working them hard ! With track dogs, you can tell by the handicapper, and the oposition, how well your dog is running; but with a Lurcher, it's only against the quarry that you can grade your dog. One night on the lamp,the dog may be OK, but four nights in a row, as I've just done with my bitch, will let you know if the dog is fit or not !! Good feed, good excersise, good kenneling and you can't go far wrong !