Are you worried about the floor or the walls? Assuming your dog is well behaved and thus you only need to worry about the floor, I don't know that I'd trust any tent material to hold up to repeated abuse by a 150 pound dog's claws. Hit the hardware store and get some 4 mil plastic sheeting for about $10. Cut a section just big enough for your entire tent (it's easiest to cover the entire tent for when rover climbs on you or whatever). The weight penalty should only be a few ounces.
if you're worried about wall durability and so forth, well, I'd imagine that if your tarp pitches have survived him, most tents should fair well also