There are a couple of Blackdog excerpts online, for people who like to taste a book beyond the back cover before they buy it. One is on my website, here. It’s not the start of the story, but the first appearance of the hero, Holla-Sayan. The other excerpt recently appeared on Amazon as a preview of the Kindle edition of the book in the US and in the UK; it is the first part of the first chapter.
And just for fun, here’s a link to another excerpt, although this has nothing to do with Blackdog and is for a somewhat younger audience. It’s an alternate chapter from Torrie and the Dragonslayers, which didn’t make it into the book, though it stands on its own as a vignette telling how Torrie and Cossypha first met. You can find it through the page about Dragonslayers. It’s a largish pdf, but in its defence, it’s illustrated with faux-engravings of the Wild Forest.