I'll try it if he starts doing it again. I don't know why he'll do it sometimes, then not do it. He quit doing it about the time you mentioned gabapentin. I have no idea what's going on with his neck. I assume the implants are all 6 broken. He still has the lump of glue under his chin preventing him tipping his nose down and opening up that space between C1-C2 too much. (I bet there's a surgical name for that lump of glue, wonder what it is.) His neck pops like it did before surgery. I hope he isn't intermittently pinching or misaligning something.
Life is rolling along. A few days ago I noticed him walking to a location he likes to hang out in, in the doorway of the living room, and he was taking little steps with all 4 of his feet like normal dogs do. The only real difference was the rounded back and head carriage. It was cool. I need to do his back stretching exercises again. He can straighten, he just doesn't usually. For a while before surgery he was stretching it himself.