I have a bad knee and no matter how thin I am, the only exercise I will be able to do is walk... Is that enough? Will I be able to lose weight just from walking?

Also how long after surgery before I can start walking my extra large dog again? He weighs 140 but is very well trained and does not pull at all. (Strange question, I know, but he is very spoiled)

Walking is great exercise! I would suggest that you do some weight training also as that will help your metabolism and help you "keep muscle" as you lose weight.

A pool might be good for you as well. My mom just had her knee replaced on Wednesday (she has already had both hips and the other knee replaced), and the pool has been a HUGE help in keeping her limber, building her strength, etc. and preparing for the surgery.

Oh I understand the dog.. I have a Vizsla that whines at me for her walk every night! :laugh:She isn't 140lbs, but she likes to pull and she is strong!! If your dog lets you walk slow I would say within a couple of days you should be ok. I went out with a friend within a couple of days of surgery who held the dog or atleast for part of the walk so I could test it out and hand over the leash if I needed to.

Best of luck to you!!!! I am two months out and SO HAPPY I did it. The anticipation was so much greater than the surgery or after-care.