This is the very first thing I was told 18 years ago when I started researching what it took to get a GOOD german shepherd that might be breeding potential.
"What is WRONG with your dog?" Yes, you need to know your dog's good traits but until you can objectively sit down with someone and explain every fault that your dog has, without being offended, you aren't remotely ready to breed. Let alone ready to compete.
People will talk about your dog. They will mention his good points but they will even more loudly point out his flaws. And many of them won't be nearly as nice as the people here have been. Often, going to a working club, they can be even more skeptical of "unusually colored dogs" mostly because they come into it with the idea that the dog was likely not from a responsible breeder. And, again, they can be mean about it.
That thick skin is the first, and most important, step in becoming a breeder. Second is the ability to separate your feelings and love from your dog from your breeding. Third is an objective outlook at the idea of breeding and where a particular dog falls in the spectrum.
THIS, a hundred times, this!!
As I explained to you in my last PM, I took a LOT of flack from certain club members because my dog was a mix of American and German showlines, and of course, ASLs have NO working ability, according to some people, and the German showlines are almost as useless. Proved 'em wrong, of course! But people are always going to find something to pick on, in any competitive sport. I put up with exactly the same thing when I used to ride. You learn to grow a thick skin pretty quickly.
Lord vom Gliesdrieck is the famous dog I found multiple times in the 7th and 8th generation of her dog's pedigree. The other Lord is there, too, but Winnal has confused the two. However, as an experienced breeder will tell you, it's the more recent generations of the pedigree that have the biggest influence on the dog, and well, those aren't all that great. Dad's side is better than mom's, and after looking at the colours of the dogs in the pedigree, I think I can see where her dog's colour came from. The colours are mostly sable, and a number of them are rather faded silver sables, with white underneath.
I've strongly advised her to get DNA done, so she has a good comeback when people insist the dog isn't purebred. I think it most likely is. And given the pedigree, I think the potential to make a good working dog is definitely there, too.