Me too. If I had one like that I'd probably bring her in too.
My goats shiver. I hate it. They seem to do it more when we are looking.. If they don't know we are watching, I don't see them doing it.
I have never wormed them, so I checked all their eyelids for nice pink colour - a-ok. Poops all hard. Tummies look round (not too round). Any goat or sheep people know what else I could check on?
They shiver the most when I give them some grain. I think they may be excited, but the manager of the feed store said he's never heard of them shivering out of excitement.
300 lambs here... No problem.
Lots of high quality hay, very little grain when it's bitter cold. Grain boosts their metabolism and takes energy to digest... Energy being taken away from staying warm. Best advice is do not confine them, make sure they get plenty of exercise. Confinement in severe cold leads to pneumonia very quickly. Give them access to shelter but do not shut them in. Fresh water with free choice hay and deep bedding.