I’m assuming he’s had a check-up and is healthy.
Something else, in addition to the suggestions above (especially canned, home-cooked, dehydrated, commercial raw or pre-mixes) would be Abady granular. Here’s a link to their site: http://www.therobertabadydogfoodcoltd.com/ToyBreed_5.htm
OK, their website is strange and no, the product has never been reviewed on DFA; but, I have used it and there are other regular posters here who have used it with success. If you’re interested in the product, I’d call Abady directly, they’re very helpful over the phone. I’ve called them myself and they were very friendly and knowledgeable.
Abady granular is a different texture than kibble, it looks very much like soft brown sugar but, it still contains starch. Your dog would just sort of lap it up. The bonus is that Abady granular is a very high calorie food at about 735 kcals per cup. If your pup tried this and liked it, at least he would be getting his calories.
When I bought it, I got mine here: http://www.1800whiskers.com/, but I’m sure there are other places you could find it.
