Well, I'm afraid that I'm the "Odd Man Out" here.
First, I was raised with pets all my younger years and as an adult I've always had pets.
I have three kids, 7, 11, 12.
They all have a variety of pets. Although they sometimes get lazy with a little reminder they will "take care" of thier pet(s).
Then again, I've worked in the animal field in one way or another for about 18 years.
I think one of the most important decisions is to make sure you choose a dog that will fit your lifestyle. Don't pick a breed that tends to be on the hyper side if you can't deal with the issues that go along with this trait and so on.
Do research into different breeds. Considering a mix breed could be a possibilty. Be careful to screen the pet first.
Possibly choosing a breed that could benefit from being outside during the long periods of you being away would offer some sense of reassurence that you don't need to rush home to let the dog out. Make sure there are toys, food, water and shelter When away for extended periods Professional Pet Sitters offer a good option.
I guess I look at it as not a responsibility thing but as a bonding process.
I wouldn't be so quick as to get a pet that
has a short life span unless your child has
a personalilty that would help her dealing with the loss in a short period of time.
I most certainly realize this is a learning process but think a child's first expereince with pets should be a positive one.
A good source for pets can be found on
www.petfinder.com. There is a shelter section and a public classified section.
Good Luck!
Robin in NC