After spending all night thinking about Smudge and just getting more and more angry over the whole ordeal I took the plunge and ordered a Pedigree research for Smudge. It's only up for 120 hours though. They won't mail them. 
I know nothing about genetics or breeding. So I need help. There's the normal sables and tri shelties in the mix, BUT. I noticed that several of Smudge's great grandparents are listed as being "sable merle". This is not the same thing as a blue merle, because I'm thinking that the "merle and white" are the blue merles. So could this be the problem? That sable merles were bred when they should not have been? I know you shouldn't breed blue merles together, but should you breed a sable merle at all?
There's at least three sable merles in his history, and two were bred to sable whites and the other to a tri. Please help me if you can.
Some of his great grandparents were also sable merle.

I know nothing about genetics or breeding. So I need help. There's the normal sables and tri shelties in the mix, BUT. I noticed that several of Smudge's great grandparents are listed as being "sable merle". This is not the same thing as a blue merle, because I'm thinking that the "merle and white" are the blue merles. So could this be the problem? That sable merles were bred when they should not have been? I know you shouldn't breed blue merles together, but should you breed a sable merle at all?
There's at least three sable merles in his history, and two were bred to sable whites and the other to a tri. Please help me if you can.
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Smudge's father is Max and his mother is Shelly. Max is also Shelly's father. I don't know if this would help any or not. 