Monster puppy is all limpy, he's on painkillers and to rest in the hope that it's an injury and not something more longterm...
He's got every type of chew I could find, he's getting his food from a variety of kong toys, I bought a wooden treat puzzle thing and we've been doing lots of leave practise (which he does already know) and we've started on look at me - because they don't involve putting any strain on his back end.
He's practically vibrating with unspent energy...I turned my back on him for ten seconds last night and he got through what I thought was a secure fence and couldn't get back (have you ever tried getting 20kg of wriggly puppy over a fence, in the dark, without putting any stress on his back legs, without waking your neighbours up? - it's less fun than it sounds.) He's trying to play fetch with himself because no-one else will and just being the saddest puppy in the world.
Any ideas of anything else I can do with him, or safe ways to knock him out? Either would be welcome at this point, lol