Spoke to the vet and she said it 'could' be a disc but short of doing an MRI there's no way of knowing. She did say however that it wouldn't be intermittent as it has been, he'd be in pain ALL the time. Said to keep going slow, resting him LOTS and continue the Robaxin. She is giving me 40 tablets, should last us about a month...hopefully that'll be enough. Finnie goes back for another massage on January 13th and every week after that.