
This sounds very familiar, I have an 8 year old female Dobe and she is exactly the same. She wants a walk she whines, comes back from a walk she whines, wants feeding, she whines, just been fed she whines. It is constant 24/7 whining.
I too have wondered if she is happy, but have come to the conclusion that they are just a very needy breed.
Every time I get up she's there in front of me, not knowing where I am going but walking in front, stopping to look over her shoulder to check that we are going the same way.
When I am sitting down she's sat right in front of me to make us eye level, she then gradually leans in until our faces are inches apart.
If I call one of the other dogs, she comes running, she trys to rest her head on my knee constantly, even if one of the smaller dogs is sitting there or even my 5 month old baby, she just doesn't see them.
It can get very claustrophobic for me too, we got her as a 5 year old from a family member who was not coping so is not a breed I would have chosen.
However, I love her to bits, she would lay her life down for me, I know that. She probably finds me frustrating as I am not able to supply her with the 24/7, full on attention that she craves. I have chosen to accept she is needy to save my sanity, but I don't pander to it, she gets the same attention and time as the others. If she gets over the top she is put in a 'down', which needs to be repeated many times for her to eventually stay down, then she will finally relax and have a nap.
Interesting comment about thyroid, my girls is underactive and was undiagnosed before she came to me, she has been medicated for 3 years now.