Gosh, it sounds like he's getting really good quality food, so that's not it. The steroids shut down the immune system, and stops the reaction, but I don't think it helps narrow down the source.
I have used this food supplement:
http://www.gardensalive.com/product....cd2=1195917014
with great results... provided the cat will eat it! Mine get it dusted over their dry food for every meal, and they have the softest coats, people exclaim over them.
It contains trace nutrients and B vitamins. I also use it for elderly cats who are having appetite diminishment and dry, over groomed coats; it does wonders for them.
Just a thought...
I have used this food supplement:
http://www.gardensalive.com/product....cd2=1195917014
with great results... provided the cat will eat it! Mine get it dusted over their dry food for every meal, and they have the softest coats, people exclaim over them.
It contains trace nutrients and B vitamins. I also use it for elderly cats who are having appetite diminishment and dry, over groomed coats; it does wonders for them.
Just a thought...