Does that sound a bit silly? We rehomed a 9 year old Staffie from rescue kennels about 6 weeks ago. He is lovely, kind, mild mannered dog who behaves very well indeed, all things considered.
He knows what living in a house is all about and seems to think he should be allowed on the sofa with us and to go into bedrooms and lie on the beds. We had to take the decision not to allow him on the furniture because he is moulting non stop ( white dog, so very noticable) and also claws as he turns round 3 times to settle. He is allowed on the tatty old sofa in our play room - opposite our living room - where he has the advantage of being able to see outside onto the street.
He tends to sit on this sofa rather than come into the sitting room ( where he has a dog bed) with us and generally looks rather miserable a lot of the time. Sometimes he seems pleased and wags his tail when we come in, sometimes he doesn't look very bothered.
The only health problem our vet has found is that his teeth are totally worn down to the gum, and he has to have them all out once he has settled in with us. I am just a bit concerned that although he is very friendly in some ways - likes to sit on your feet, sometimes climbs up and sits on my knee - a lot of the time he sits on his sofa and doesn't get up to greet DH or DS2 and he seems generally to be a bit sad and tired.
He likes a good walk in the afternoon and gets very enthusiastic about this, but doesn't like going out for his early morning walk at 6am - until it is underway when he is quite happy.
We took him to the local farmers market one Saturday and he behaved really well, sat nicely outside cafe, didn't bother other dogs or embarass me by having a poo 
I'm just wondering if, despite having had a pretty poor home in the past, his old owners might have been a lot more fun for him - I imagine him going out in a van with someone, and seing lots of people for example.
Is he sad? just a bit old and tired? still settling in? or worst case scenario in pain from his teeth or something else the vet hasn't spotted?
I suspect this sounds a bit paranoid but I have really fallen in love with this dear dog and want to be sure he is happy.