That is tricky. A livestock guardian mastiff would likely behave like that. It would only move if it had a good reason to do so. A bandog type of mastiff type would likely be more energetic.the OldGuy is slooooowwwwwwwwwww.... Old school mastiffs would rip thru that course.
Maybe that is why I have a ceramic tile floor and why they spend much them time ourdoors.THE MEME ABOVE...
Why I have a very good Carpet Cleaner... two dogs..
For mine it is bedtime most of the day and night unless there is something chase. They have got bedtime down to a T.He gets a bit grumpy when you tell him it's bedtime.
What you say does sound right. But how many vet hospitals can do that. If the dog can get better I do not go to the vet.We don't know what the Vet did but a dog needs to be sedated and then the Vet can check that tendons are connected by manipulating tension on one end and observing action at the other end. Even that will not identify when a tendon is partially connected/torn. I don't buy the "mimic" narrative or the nothings wrong Vet story which are click bait for an otherwise unimpressive vid.