[Ellie May]

From a recent experience with Ellie very similar to this (but not showing so much pain - more odd behavior), the first two rule outs are abdomen and spine if everything is normal on palpation. Was a cPLI done to check for pancreatitis? Also, there is no good reason to not do an xray. If the vet thinks it's the spine, but either can't handle the case or doesn't believe the problem will show up on xray, then this pup needs to go to a specialty hospital. If this is a slipped disc or the like, some other things may be recommended.