Some of the biggest points that should be addressed up front are matching peoples lifestyle(s) with a particular breed. High energy dogs often need 12-15 miles of daily exercise. Grooming demands and costs are another issue. Owners home or apartment may not be suited for some breeds. Knowledge of dog training is another...some breeds are not suited for the first time dog owner.
After those question are answered, it's easier to focus on the breeds that are suitable.
After those question are answered, it's easier to focus on the breeds that are suitable.