Hmm, I just lost one out of 15 to enteritis (entropathy?) at 4 weeks old. He was in the combined litters, had been inside in the cardboard corral at night for several weeks, weaned for a couple of days, but the Satin doe was not drying up, so I would take half the litter and let them relieve the pressure for a couple of minutes and he was one that nursed that morning. The litters had been outside on fresh grass for a week, after building them up to that since they were also getting fresh greens in the mom's cage (when they were supposed to be nursing :lol
, and I feed Purina Pro 16%. The kits also have access to pellets and oats and fresh water when in the pen, but that day, I forgot to put the feed out
He was fine when I brought them in that night, but woke to diarrhea all over the corral, him cold and lethargic/unresponsive and a poor little mess. Warmed him up with a quart ziplock of warm water and a towel with a handful of angora fluff. I also tried to syringe some lukewarm water into him, but even though he didn't struggle, it just dribbled out. He was gone in 3 hours and I buried him in the back yard.
It has been a week and none of the others have shown any sign of illness since, and none of the first litter showed any sign of illness. If it was weather related, I would think more of the 15 kits would have come down with it by now.
Also, even though the kits are outside all day, I am outside with them working around the property and they have the top of a pet taxi to hide in if they get scared, but I don't remember any undue terror in the babies.
My theory of enteritis striking like this has been that the doe has a mild form of it and passed it to the kits in the nestbox and that once they were on their own, any stress/scare could allow it to flare up. I would still think that theory holds up, except in this case, none of the other 21 kits the doe has had, nor the 5 angoras she fostered have shown any sign of weakened immune system.