Dogs back end

[Millionairerow]

Dog is a working cocker, 8 years of age. Seems to be holding his back end like you or I would if got sore bum/back. He seems ok but we have 2 male dogs, same breed and age. Is it submissiveness or is he sore? Any ideas?

No replies yet but an update. Dog laid on back for tickling, tickled round middle area and howled as if I'm pain when I tickled there. He did it twice. Bet tomorrow methinks- any ideas?

Has he got a tail?

And if he has enough of one, how is he holding it? What's he been doing over the past day or so?

He does it is a bit down. He's eating etc but seems a bit unsteady
On feet when he's been lying for a bit. Seemed ok rest of time eg husband said he seemed ok on walk lazy night. Seems stupid to say but from last years check to this he's lost 2 kg from 19 lb to 15 lb. will get him checked out tomorrow if can fit him in.