Thanks for this advice. Is the Brooks saddle really worth $140? I don't have covered bike parking at my house, so a saddle that's weather resistant is certainly appealing.
Well, the worth of something is certainly an individual choice, but in 1990, I whinged about the padded seat on my new touring bike which made my undercarriage incredibly sore. Sheldon Brown suggested I try the B17s (the 'lady' version then) which was even then ~$100 and a bit spendy for the likes of my grad student means, but I decided to try it given he was a legend with reputable advice. 35 years later, that saddle looks less aged than I do and will certainly outlive me. ;p I try to remember to oil/condition my Brooks saddles once per season, maybe twice in the winter when the humidity is very low, but that's it.
As for unsheltered parking, saddle covers are super cheap and I always keep one on the bike in case of inclement weather. Given that you have a GSD, you might also consider getting a 'bike parka' or something similar to cover your bike and protect your investment since keeping it dry will reduce wear and maintenance on all the parts of the bike, not just the saddle. One other thing to consider is the aesthetic of the Brooks as, maybe I'm just an old-fashioned geezer, but they are simply beautiful.
That said, if you're still interested in a Brooks saddle, I highly recommend you try riding a bike equipped with one just so you get a feel for it before buying one as they don't work for everyone, but they do last forever if you keep them dry and condition them occasionally.
Sheldon's website still lives and this is his wisdom on Brooks saddles -
https://www.sheldonbrown.com/leather.html