dmako,
If you wanted to remove it once in awhile, might not be a huge problem, but it's not a five-minute job. All the nuts are tightened with a torque wrench. I don't think it would work to hinge it, either. The "legs" are bolted between the floor and the cargo tie-down loops behind the seats.
Consider it semi-permanent.
I will try to remember to take a photo of where it's bolted in on the bottom. It's going to be hard to see because of the cargo tray.
Kris,
Pyrs are like no other. I'm using a holistic vet now and he has clients with a pair of Pyrs that had a dozen pups about two and a half months ago. He's getting a real education about Pyrs. They're way cool, but not the world's best house dogs. Unfortunately, mine has to be a house dog.