Pumpernickel is a real cutie!!!!
I'd suggest you use some sort of kicker in front of the dog to illuminate the face/front and/or use the shadow lightening capability in Photoshop or Lightroom or Aperture or whatever you're using to process your RAW files.
It seems to me that you have the lights set very high so while you have no shadows on the backdrop (that is good) you have very little light falling directly on Pumpernickel's front (that is not good). I'd drop them a little for smaller dogs.
You have just learned the most fundamental of truths in pet photography -- it's hard to do it alone

. You have to be the handler, the baiter and the photographer and that only works when the dog cooperates fully. Frankly, in pet photography, most dogs are like Pumpernickel and they'll hate the stage, the backdrop and, most of all, the popping lights.
This is a very nice effort given the conditions. You can just see how shy and sweet she is. The eyes are wonderful.
How did the studio work for this shoot?
Jim