I use either Pedro Gold for working dogs or Gain Greyhound the yellow bag think its 28%
You can get them in most pet shops !
But id always mix the greyhound feed wudnt giv him just dry foog...!
Chiken carcus is full of protien and keeps there teeth and gums clean too
Every 2 weeks some raw mince..
Keeps him good and strong
Thinking of changing to red mills ?