Kind of a mixture. We were feeding Acana Duck & Pear for a while -- he does well on it. We also have been feeding Go! and Now! every now and again. We had a bag of Dr. Tim's GF in between there too and still have some of that left. I like to experiment a bit, and see what he does best on. He definitely did horrible on Fromm (ate it for 7 months or so, not happy with results) so no more of that.
He definitely seems to do best on Acana Singles and NOW (I prefer Now over Go, too). Overall I think I've discovered he does best on moderate protein/fat, and maybe not so complicated formulas (only one or two sources of meat, etc). So I try to find simple-ish formulas but still with enough protein/fat since he is so active.
I don't do many extras -- he just gets canned food usually for dinner (it's always Weruva or Cesar if I'm being cheap), occasionally he gets a squirt of salmon oil when I remember, and I sprinkle some Wysong Dentatreat on his food. Treats are almost always Cloud Star Buddy Biscuits (soft ones) and I rotate thru flavors.
So anyway currently he is eating Now GF Small Breed.
Brit & Jackson