I must be a lucky one. Brando could care less about the rain. Ruby has always been really good about the rain, but because Brando will run right off the porch for a walk in much heavier rain, Ruby does the same.
Considering it rained almost every day here during this summer, it is good that my b-kids are easy going about the weather. This summer meant that all their walks during the day were all in the rain. In fact, one time walking a thunderstorm hit and it was a torrential downpour (like someone turned a high pressure shower on). No problem. The kids were soaked and they did look at me like "mom, what the heck is this", but they were fine and we did 2 miles in it (we were 2 miles from home). After that, they cared even less about the rain…I guess they figured it couldn't be as bad as that.
Granted if I just left them outside on their own, they probably would hang under the porch, but walks (their regular walks of 2-4 miles) are no problem because there is always adventure of some sort on the walks.