If you are not sure, it really doesn't matter. Different breeds have been bred with specific purposes in mind. Dogs bred for scent, for racing, for retrieving, etc, will exhibit these traits. Consider which characteristics you would like and which will annoy you. Do recognize, however, that dogs show individual personalities, and variety exists within each breed.
Breeds are only a general indicator of what to expect.
We at dogsindia have had personal experiences, and see the harrowing experience some others have gone through. One lady was even threatened by certain people. She tried to report the matter to higher authorities. So please try to get your puppy either from good homes, reliable owners and breeders, or adoption centres. By then it must have had its Primary Vaccination against Parvo and other diseases.