I would go with a rescue from a reputable organization. Pretty much all breeds will have a rescue org. Here is the one for Frenchie's: http://www.frenchbulldogrescue.org/ . Unlike pounds and shelters, rescue orgs will foster dogs in homes, typically with lots of other animals, kids, etc. They will expose the dog to a variety of stimuli and different situations. They will be able to provide you intimate information on the disposition of the animal. Submissive or dominant, good around other animals, good in social settings, good around children, barker, playful or laid-back. Further, they will spend a good bit of time understanding you and your situation. Fenced yard, keep indoors, ability to exercise, will dog be left alone for long periods, etc. They will even perform a site visit. In fact, this is one way to tell if you are dealing with a reputable rescue org. This is the best way to get a dog that meets both your circumstances and the needs of the dog. The downside is it can take a good bit of time to find a good match.
Now, just to be clear, I am all for taking dogs from shelters...my wife and I have always supported the local Humane Society. In the OP's situation, I feel that reducing as many unknowns as possible is the best path. If you are getting a puppy or you have the experience, time and desire to deal with potential behavioral issues of an older dog, please do explore the local shelter.
