Chaos just isn't as round as he should be. In fact, next to Fuzzball, he looks rather emaciated.
I've decided to give him olive oil and FerreTone everyday, as opposed to just occasionally, as well as showering him with treats.
He's got an interesting food behavior. If I set something on the floor, he may or may not eat all of it before deciding to scamper away. However, if I hold him by a saucer of olive oil, he'll lap it up. Likewise with the treats. He may or may not pick it up off the ground, but if I hold him and give it to him, then he'll take it and scamper off to eat it when I put him down.
Hopefully this 'forced feeding' will help him put on the ounces. (As an overweight person, it's funny to think of putting on ounces instead of pounds; the little guy will only weigh about 2lbs when he's at a healthy weight. He's a small ferret boy; not one of those big 4 pounders.)
I guess I need to be careful at first to not over-do it. I wouldn't want to make him sick with all the new supplements.
The biggest problem with adding weight to him versus adding weight to Fuzzball is that while Fuzzball sleeps all the time, Chaos can be rather hyper. Fuzzball will plod along on walks, but Chaos will run. She will just kinda poke around, but he's busy climbing up the furniture. I guess he's been working off more than he's been taking in.
I took him to the vet, and she said that his blood-sugar was borderline low. He's often having little seizures, though, so I'll probably have to take him in again to get some medication. I've been giving him a drop of Karo syrup when I see him seizing.