I lost the most weight walking my little Maltese dog. We had a leash law, and I lived in an apartment, so I could not just let him out. I lived in a very hilly area, and that dog wanted out three times a day. Even in freezing sleet, he wanted to be outside smelling everything...and he always wanted to run UP the hills.
At the same time, I was working at a nursing home, and staff got to eat anything the residents did not...but we had to share it. You could NOT be piggy or the nurses would "kill" you. Half a sandwich, half a pear, tiny servings of everything.