Try this: See if you can get access to a big, commercial / catering style Mincer. One with a big heart. Fit the 'course as hell' plate in it. Run stuff like lambs ribs through that. along with what ever meat you want. Then mix that, along with your veg, bit of bread / meal, what ever, in a wet broth.
Greyhounds are renouned bolters of their food. God knows why. They just are. But dogs can't suck and that makes it a right bitch for them to bolt such 'wet' food. So, that way, you'll be giving them all the goodness you care to, without them risking Bloat or choking themselves to death