Here are some pics of my sheep.
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For our sheep, "out to pasture" means off hay, out of the winter/sacrifice pen that gets so over-grazed it's practically just mud and out on grass. I don't lock up my sheep, they have a little shed and a covered space to keep them out of the weather, but they aren't shut inside all winter.
What worms are you treating for? If you got a fecal float and you know what you're trying to knock down, different meds work better than others, and if you're just doing a broad-spectrum de-wormer, you'll want to switch every other year or so to assure that the worms don't become resistant to your favorite go-to med.
I wouldn't have locked up sheep in a barn all winter, nor would I leave them without shelter - so no I don't think you did anything wrong. Everyone with dedicated 'winter pens' knows how disgusting they get in a winter season. It's just the nature of the rotational grazing's sacrifice pen.
All animals (including humans) have what's called an "acceptable parasite load" meaning we always have parasites in/on us. They only become a problem when we are immunocompromised (often caused by stress or other illness) and the parasites become over populated. That's the only time the parasites need to be dealt with. If you are just de-worming blind, I'd run some fecals through the Vet and see what all you actually need to be treating for, if anything![]()