When we went for our walk yesterday, Robinson suddenly started limping quite badly, and when we got home he was very quiet and sorry for himself. When I got home from my movie expedition, I found him lying on the floor not wanting to get up. He didn't eat his supper and was in quite obvious pain overnight (whimpering every time he had to move).
So off to the vet we went this morning, and he's spent the day being prodded, x-rayed and having a chiropractic alignment. The upshot is that although he shows some minor arthritic changes in his neck, he doesn't show any serious damage, and may in fact have had a pulled muscle. I've got some anti-inflammatory to give him as needed (I don't like using it, but it does help to ease the pain when necessary). He's also supposed to rest (ha ha) and will have another chiropractic treatment on Thursday.
Of course, my wallet (or credit card) is lighter by over $500 - so much for the new lens for my camera! - but it's worth it to know that he's okay.