thank you for this Skycat, very interesting read, what is also important is diet in a running dog, i have a 2 year old 5/8 3/8 Bull X and a year old Saluki Greyhound i walk them 3 times a day whilst working 9-6! i have seen boys run they're dogs whilst riding up farm tracks on a quad, surely that's an accident waiting to happen? i'm using Gain 28 greyhound food at the moment and now and again i buy tripe or chicken mince, can anyone recommend other foods that may be better?