Illness can definitely cause a dog to blow its coat, dbg--combined with spring, I suspect that's all that's going on with Raggs' fur. And having company can be exhausting!! So that could explain his lethargy, too. If that's all it is, then he should be feeling a bit more energetic in a day or two.
What does Raggs do when he goes out so many times after his morning meal? Could he just be feeling a little more energetic and wanting to be outside that time of day?
Keeping you both in my thoughts and prayers, as always!