Bookworm, Does the lumps feel like our antbites would or do they feel dry and crusted over? Sometimes they could have excema type bumps, and they tend to be very itchy. Your vet saw him though right?
As far as food there are so many really good foods out there. The most common problems dogs have with kibble is the grains.
Here is an address to a different chicken related forum, so I hope I am not "breaking" the forum rules by posting it. It is basically a list on how to evaluate your dogfood, scroll down until you get to the list and see what you find, if you scroll down even further there is a list of foods that have already been evaluated.
http://www.backyardchickens.com/forum/viewtopic.php?id=67485
Here is another one that is also really good.
http://www.dogfoodanalysis.com/
I wish I had a brand name that was the "best food out there" but I don't. My dogs are on the RAW food diet, because I had a Westie that just passed a few months ago, with horrible food allergies and I wowed I would never have that again, if I could prevent it.
And yes, Proteinman is correct, we all want to see pics of your little adopted guy..Buster.
oops just saw the pics of Buster and he is a beauty, thanks for sharing