We have a GSD cross who we got from the RSPCA 3 years ago. He is approximately 8 years old. We spent the first two years struggling to get him to eat. We finally moved him onto Burns food which he loved and wolfed down. After some trial and error we concluded that he was probably wheat intolerant and got bloated when he ate high wheat foods so then didn't feel hungry. Unfortunately when he is on the Burns he looses weight. We have tried increasing the portions past what he is meant to have but this doesn't seem to be working. We can't afford a much more expensive food than the Burns, any suggestions?
On a side note we have taken him to the vet but there appears to be nothing wrong apart from being a slobbery lump.