Do you have time for a dog? Dogs require lot more human time than cats do. They MUST go out, in all weather (even when THEY don't want to!) Are both of you working? So the dog is going to be alone for at least 8 hours per day. How long is your commute? The moment you get home, the dog is going to want to go OUT. Do you have the energy for that?

There are several breed selectors on line, which will help you learn about the different types of "work" involved with dogs, help you narrow it down to a manageable number to consider when you visit a shelter. These are just a few, they get you thinking about different aspects of dogs.

http://animal.discovery.com/breedsel...lectorindex.do

http://www.iams.com/iams/en_US/jsp/I...jsp?pageID=DBS

http://www.5stardog.com/dog-breed-selector.aspx