Many thanks for your helpful reply. The condition of my dog's nose isn't as crusty as your photo and looks more like caked on dried mud! He hasn't got any open bleeding areas thankfully but does have areas around the nostrils of depigmentation.
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Hi, It sounds like hyperkeratosis definately and I have noticed that his nose is blacker in the summer and lighter brown in the winter but this is the first time it has become crusty.
Thanks for the links, the nose butter sounds very positive