if it is just for fun - then you look to being sensible .
if it is training for work -- you better train in all weather -- extremes , wind , rain, snow, dark of night . The only time to call it quits is electrical storms , lightning.
I do believe in the lightning storms the dogs were still required to manage sheep from stampeding , just not so safe for the handler.
You can't have a dog that goes sour and quits when it is unpleasant.
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