I saw my dog playing with something on the driveway yesterday, and went to investigate. I found this rather large black spider on his back, looking a bit the worse for wear. I gingerly flipped him over with a large leaf and he sat there looking at me angrily, raising his front legs and waving them around. I managed to co-erce him back onto the leaf (a large one, I might add!) and took a few pics of him before he started advancing towards my hand. I have never seen anything like him before, he had a marble-sized body, greyish and slightly hairy. An ID would be gratefully received. View large, if you dare!