Kimber was Ms. Destructo until she was about 8. The only toys she didn't destroy were her Buster Cube, Tug-a-jug, and Kong, and I think that's because she wasn't chewing on them directly and I picked them up as soon as they were empty. I tried every toy suggested here, and nothing could withstand her back teeth. Then I read a story about a lab who chewed part of the sheet metal off his owner's car and gave up. I bought tennis balls in bulk and at the re-use sports store (and as soon as she stopped fetching them and started picking at them, took them away), I bought 99 cent frisbees, and I bought the 3-for-a-quarter stuffies at goodwill (making sure they were stuffed and not filled with small beads).
Maybe something's come out in the past few years that is more durable. (Oh wait, the jolly ball meant for horses lasted, but since she couldn't destroy it, she never played with it, lol.)