IMO the soho is too small for a 6lb dog. My yorkie is 7lbs and to get her head out of the opening hole I had to unzip the back, couldn't get her out going front to back. She also can't be fully shut in the bag. I don't use my soho anymore, it's purple.
Also, the bag is very heavy without a dog in it. It's well made and beautiful, but IMO it's better for dogs under 5lbs.
Here's pictures of Kaji, he's 7lbs too, in his bag.
http://www.yorkietalk.com/forums/yor...aden-soho.html