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Dilutions in dogs

A friend of mine who works in rescue recently sent a picture of a Shih Tzu, asking my opinion on her unusual color. Because I am very fond of dogs, posts about them appear here from time to time. They...

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Albino Shih Tzu

This is Angel, the Shih Tzu with the mystery color mentioned in my previous post. When my friend Gretchen contacted me, she wondered if Angel might be a pale lilac dilute. That is a dog that has both...

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More albino dogs

Casper, a “white” Doberman owned and photographed by Kira Vance.In the previous post, I mentioned that one form of albinism in dogs had been formally identified in just the last few months. In October...

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Is this still a horse color blog?

So what do albino dogs have to do with horse color? Certainly the fact that there are “cremello” Dobermans is interesting, but why is that relevant to this blog? The story about Angel and her unusual...

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Why Extension?

A friend of mine pointed out that one of the reasons the term “black-based” is so popular is that the name of the gene is not particularly illuminating. She had a good point. Just why is it called...

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Extension in other animals

When talking about horses, the simplest way to explain the interaction between the two common pigment-type switches, Extension and Agouti, is this: Extension determines whether or not there will be...

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The basic (horse) coat colors

The three basic colors: bay, black and chestnut. Some include seal brown, making it four basic colors. Since some time has passed since I last posted to the blog, I thought it might be worthwhile to...

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Translating horses to dogs

Before I return to basic dog colors, here is a short guide for translating horse color and dog color. I have posted about this a few times before, but since there is going to be a lot of new material...

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Wild colors and the spectrum from all-red to all-black

As I mentioned in an earlier post, the relatively small number of alleles in horses gives us a limited window into how pigment-type switches can work. This does make the basic coat colors much easier...

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Modifier relationships – it’s complicated

In the most recent post in this series on pigment-type switching, I talked about the fact that both horses and dogs have a wild color that is a combination of red and black pigments: bay in horses,...

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