Thanks all who replied,
 
Just an update and more info
 
His cage mate is big and healthy, they have been together for the last 4
years.  I did have them stay at a friends while I was on vacation, but
they don't have any other ferrets, and it started shortly after that.
 
I did open a new bag of food, currently feeding 50/50 of Shepherd and
Greens and Iams kitten food, they love it, as for treats, 'Bandits'.
 
I didn't think of ECE, cause the other one is healthy, but all the other
symptoms point to it; green smelly runny poop, loss of appetite, weakness,
sleeps more, some dehydration.  But the other one is healthy, can this
happen??  I thought it would run through a house like wild fire if they had
contact with each other.  I'll have the vet run another poop test for all
other mentioned problems.  Don't see any swollen nodes, vet didn't either.
 
What are the treatments for ECE, or do I just ride it out and keep feeding
him??  I do see him eating a little of the whole food, and drinking, so he
hasn't given up on that altogether.
 
Sorry if I rambled a little, just trying to make sure all the facts are in.
 
John
[Posted in FML issue 3536]