My sympathies too, Avila – I work in a shop and am on my feet a lot of the time. I seem to remember something on the TV (maybe on the Trust Me I’m a Doctor prog, or something similar) there was an item on people working while standing vs people who sit at desks – I think it showed that standing (at least for some time each hour) was better….
Like you, my problem is that I go home feeling tired and I tend to slob (certainly on Sundays – well, it’s supposed to be a day of rest) but I can clock up a lot of steps just by being at work. Yes, sometimes it is difficult to force yourself into extra walks. You have a dog – I have a plot at the allotment (15 mins walk away). Just do whatever you feel you are able to do. If you are able to sneak in any kind of extra movement while you are standing, I think it all counts!