The cover looks like a manual designed in the MS-DOS era. Something more modern may do better justice to your content. Lose the italic times new roman, try Helvetica. Dog/wolf is giant, this isn't a Jack London novel. I'll design you one if you would like.
Edit: as absconditus pointed out below, it does look like a lot of other O'Rielly books. Suppose the highly analytical people that read these don't mind.
Well, I don't have too much control over the cover design - O'Reilly does that.
I did pick the animal. The animal is a 'dhole' which is popularly called a 'red dog'. 'Red Dog' happens to the original secret code name for the Windows Azure project.
How that code name came to be is an interesting story in itself and I open Chapter 1 with that.
Edit: as absconditus pointed out below, it does look like a lot of other O'Rielly books. Suppose the highly analytical people that read these don't mind.