I bought my puppy out of the Greensheet classifieds, did I do wrong by doing so? Before doing so i visited the animal shelter and they only had large breeds, I live in an apt therefore i wanted a small breed, I also went to Petfinder but most that caught my eye were posted with a no children sign , and i have a 3 year old son.
You've already gotten the dog, so don't beat yourself up or let anyone here do it for you.
For the benefit of others, though, keep in mind that shelters on Petfinder usually do at least some minimal temperament testing. If they tell you that a particular dog may not be suitable with young children, or with other dogs or with cats, it is to avoid possible problems with a new placement.
Private surrenders will not normally give you the benefit of that information, even if they have it, so it's a crapshoot. They will tell you whatever they need to in order to place the dog.
Having said that, the best dog I ever expect to have was a private surrender in the local shopper. We were exceedingly lucky, and I wouldn't count on that kind of luck again.