Them Dwarven folk.

[Aganzir]

Originally Posted by Groin Redbeard

Good point. Is is possible that they could bring livestock into their mountain halls, and simply bring the supplies to feeding the animals inside?

I think that's quite possible (and it brings in another question: ventilation systems). The most logical scenario is that the animals spent summers outside, guarded by a few herdsmen. Most of them were butchered in the autumn and salted or smoked, others spent the winter inside the mountain. Calves were born in the early spring.
It requires so much fodder that it wouldn't be profitable to keep them inside all year.