It's very HOT as in spicy. He may be bored, too. You might need to spend some more time with him. Any chance you could bring him in, even for a couple of hours? Dogs love being with people. Or, he could be hot and trying to cool off. You could also try and get some 2x4s to hammer right beside the bottom of the fence maybe, to keep him from accessing it. I have never had that problem so don't know, really.