Thank you for all the lovely links. You saved me a ton of work! After looking at all of them, I have chosen the ones that I think best represent Shasta. Hope you like them!
I saw a couple of dazzling "silver dapple" pictures, but upon further reflection, their body coats were too black to qualify as "chocolate" in my descriptions of Shasta in both books 1 and in book 3. But it was hard not to use them because they were so striking.
At the very bottom is a quick picture of Sunny, the cream-colored twin. He glistens a pale gold in the sun.