I get mine from the retired greyhound trust. It is basically x meat and rice formed into the nuggets. It is low this, that and the other. I used to get the Arden Grange equivalent, as the sanctuary we got him from used it, but the retired greyhound trust variety works out about the same cost and they do OK out of it too.

He does have that physics defying trick of shitting more than he eats. It is often about right (3 or 4 on the Bristol Stool Chart, my time in infection control coming in useful there,) and if it is loose, we can normally attribute it to a treat he may have had. Gravy bones are OK but the biscuits that look like small sausage rolls, give him two and he is off up the garden for a spray.. Delicate stomachs compared to the mongrels we have had in the past so he isn't allowed to have our left overs. The exceptions are the skins when we have poached salmon or any other fish where we aren't fussy about the skin, and when he is off his food, sprinkling a bit of parmesan over the food has him racing to the bowl. His treats for chewing outside include occasional tripe strips and boiled bones.

That said, he regulates himself, rarely over 30KG and rarely below. (At this moment, hot weather etc he isn't eating as much and I can make all the ribcage out, I can usually only see the back two. He is about at his racing weight now, and a Kg more won't hurt.)

His farts though.... It's that defiant look he gives you when he notices that you have caught a whiff.