Spondylosis occurs in nearly all old dogs, it just depends on whether it causes clinical symptoms. As with people, in a lot of cases it doesn't but most people over 40 have it to a degree but most wouldn't know.

There was a border collie lived just round from me and they lost him a couple of months ago. He had always had digestion problems but he took a turn for the worst. Turned out he had severe spondylosis and the calcified bone had grown downwards and caused his bowels to detach and collapse so his ability to control himself was non existent and he was in a lot of pain and the vet said his bowels could be expelled from his rectum at anytime. He was only 10 years old too. You wouldn't have been able to tell from looking at him beforehand. No roach back or anything like that and I used to see how he could still sprint after the ball when his owner threw it for him. Maybe the bone grew more downwards rather than upwards. In any case, they had to have him put down. Problem with spondylosis is that it just keeps growing and will grow back even if they operated to remove the horns of calcified bone that grow. I think in his case, the symptoms were a more worst case scenario for spondylosis. Most of the time, it wouldn't cause such massive problems.

That shot of Pirate sleeping reminds me of our Jess sleeping, lol. Our Jess still has her hearing but she sleeps that deep these days, she can sometimes scare you into thinking she's dead.