This is a stupid question because I think I already know the answer...but does whether or not a dilute keeps a good coat run in bloodlines?
And it's kinda interesting, though not the same thing, that people baldness seems to pass in the mother's lines to some degree. Any hint of that in dobes?
I don't think it's sex linked Mel. Male pattern baldness does genetically come down through the female liines.
I've never seen any studies done on that possibility but the chances of good versus bad coat in dilutes (due to CDA) does run in bloodlines. I'd seen several of Michelles fawn coats (which are more likely than blue coats anyway to be less a mess because of CDA) on fawns that were bred by her who actually did have better than usual coats and kept them. So I figured that I had better odds of getting a decent coat from her breeding than any other.
But Royalwood (Washington State breeder) had bred to Chaos about the same time Michelle did and I don't remember if it was their Chaos litter that had two fawn bitches who did retain good coats or it was the following generation that did and Toad is a Chaos Grandson.
I think the bottom line is luck of the draw--genetics can only predict so much in so many cases and because a lot of this stuff (and I think prospects of CDA falls into this category) is polygenetic it makes it much harder to predict.
But it remains the case that your prospects, with dilutes, for good coats is best when dilutes in preceeding generations of the line have had and retained good coats.
I really don't think there have been any definitive studies done on CDA and Dobe dilutes. It's kind of frustration but I suspect it's regarded as not high on the importance list. But it's really irritating to me when some one with a dilute dog tells me that her vet says the coat is bad because of CDA (because the dog is blue or fawn) and not a thyroid problem.
Hypothyroidism is so common in Dobermans that any dilute dog whose coat is getting worse should be tested with a full thyroid panel.
Toad was both hypothyroid and fawn--but treating him for the hypothyroidism left him with a coat that lasted 14 years and made vets who came into our clinic and saw him and found out how old he was drop their jaws. The clinic owner liked to make fun of them--he'd have them guess how old he was. By the time he was 6 no one who hadn't known him since he was a puppy believed how old he was.