One of my toy poodles years ago did a similar thing. She was jumping up at the door to be let out and sort of twisted in mid-air and yelped. She wasn't walking funny but just acting weird and wouldn't eat. I don't remember exactly what we did (x-rays, etc.??) because it was so long ago (I'm talking probably in the '70's). I do remember the vet put her on medication (a steroid I think) and told me she would be drinking a lot and asking to go out a lot. She was fine after that. I hope that Marlin will start feeling better really soon.

Oh, and Marlin..... please do make your human lift you on and off the bed. Remember you are one of the family now and they are there to do your bidding.