a good easy way to ad vedge , is frozen mixed vedge from supermarket, i get the ones with peas carrots brocoli in ,, avoid sweetcorn , comes out exactly as it went in.
agree with the irishman who's name i cant spell, rice is good for them but like the vedge you dont need loads.
personly though i like the beef bones , i get the masive leg bones for free, and leave them on the garden the dogs will lay and chew them for an hour or so, i leave them for a week or more, and the dogs chew them most days.
plenty beef , lamb, horse, meat pluss rabbits game ect