Hmmm... I am really against purchasing dogs from pet stores. I have issues with commercial puppy mills. If I were you, I would go to an animal shelter to see the animals there that are up for adoption.
Animal shelters make sure that the dogs that are open for adoption have all the shots they need so that they will be safe. They are also neutered or spayed to make sure that they will not wander unlike dogs that are in heat. Also, they are trained to deal with families and children, so you wouldn't have to worry about biting or any other untoward behavior.
Please do adopt from animal shelters. The dogs there need loving forever homes. 
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