There are no hard and fast rules. All greyhounds are different, you feed them the amount depending on how hard you work them. If they are resting you feed them less and if in hard work feed them more.

I have four dogs each weighing 28.6kg, 33.2kg, 34.6kg and 32.8kg. The first dog puts on weight easily so he is fed 520gms meat and maintains his weight no problems. The 33.2kg dog has a higher metabolic rate so therefore burns fat a lot quicker, he gets 600gms meat. The 34.6kg dog loses weight easily so he gets 650gms meat. The 32.8kg dog puts on too much weight too quickly so he gets 500gms meat.

When I step them up in distance and therefore they get more hard work in, their meat will increase.