Thanks for the research, Indy. I am going to go ahead and get a fecal egg count done, and then I will deworm him once again. I suppose I should have done this sooner, but since they were shrinking and my vet didn't seem concerned, I thought he was on the mend. Better safe than sorry.
Fly management....We live deep in the backwoods in Canadian Shield country and it is extremely "buggy" here. Horse flies, deer flies, moose flies (HUGE things), mosquitoes, etc. I spray them every three days with a pretty heavy-duty fly spray and they have some nice open areas in their summer pasture where the wind does a good job of keeping bugs down. I cheer on the hoards of dragonflies that come out every afternoon to eat my nemeses, hehehe.
I remember seeing something about fly trap boxes that I think it was you who built...maybe someone else. I wonder if this would even make a dent in the bug population here...somehow I doubt it.
Brantford is about five to six hours from us, so close enough.
I'd also really like to learn more about natural parasite control using something like diatomaceous earth, which I have heard of people feeding to prevent parasites. (It doesn't kill anything that's already there, from what I understand).