Jane has given you sound advice. I can't help you because Zoey doesn't go for walks. She just runs around a lot outside in a fenced in yard and also runs in the house. Also, Zoey wouldn't be considered a miniature since she weighs between 8-9 1/2 lb s.
If I could walk for exercise, I'd take her with me.
Just make sure you have plenty of water (for you both) and enjoy your trek!
Whenever I''m tempted to eat something I shouldn''t, I remember the following: "Don''t eat for the moment''s pleasure, for when that moment''s gone, the consequences will stay with you, from that moment on."