Prompted by about half a dozen dogs, including three Border Collies, I saw at our local country park on New Year's Eve. The weather had suddenly closed in with a stiff wind, dark clouds and heavy rain. I was heading back to the car but these dogs either didn't notice how unpleasant the weather was or just didn't care! They scarpered off ahead off their owners, tails wagging and barging through mud and into ditches.
Years ago, our family had three Cocker spaniels of varying ages. The eldest wasn't at all bothered by rain and snow and would still happily go for walks in lousy conditions. She was more of an outdoorsy dog than the younger two. They, on the other hand, could not be persuaded to go outside even in light rain, especially as they aged. Interestingly, all three spaniels took care to avoid remaining mud and puddles in dry weather and would pointedly walk around them. I can't imagine today's loony springer spaniels or weimaraners being so delicate!