Boy or girl puppy

How great a pet a puppy will grow up to be isn't based on it's gender, it's based on how well you train and socialize it.

Unless you plan on participating in dog shows, your puppy should be spayed or neutered before it's 6 months old. Female dogs are healthier and live longer if spayed before the onset of their first heat cycle. Male dogs are less likely to want to roam or fight with other dogs if neutered.