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I ordered a set of Lewis rubber boots for this exact reason (and for crusty snow). I'll be sure to post on their effectiveness when we have had a chance use them.
scott,I have been using Tough Foot on my dog this year, and I think it definitely helps with pad wear. That said, if I am going to hunt an area with lots of basalt for several days, I will boot my dog. I've had mixed success with the inner tube method. It saves their pads, but I'm having a hard time getting the vet wrap to stay in place, which in turn creates a lot of chafing on his knuckles.