I think I'm going to have to get one of these for Zoee. Although, I am worried about her getting depressed with it on. Anytime we put anything on her.....glasses, hat, shirt, life-vest.....she will just stand perfectly still and not move and has a sad look on her face. But I will just have to do like you did with Duke and introduce it to her gradually.
I am so glad it works for you!! That must be nice to be able to walk both of those big boys without trouble.