I get tripe from a local small scale slaughter house, its straight off the cow with bit of grass stil in it. I hose it down and cut it into terrier and lurcher sized pieces, i also get sheep heads which i chop into pieces and bits of cow fat, meat and bones. So they get bits of all this through out the week, but was wondering if they need anything else in there diet, some dog biscuits or veg, as they seem to be constantly eating grass.