big dogs are lots of fun, but they need space. and they need to run, especially as puppies. unless you are the type to go out and run 2 or 3 miles a day,

or have a park where you could take her to let her lose to run i wouldn't do it. go with a small to medium dog who can get enough exercise and thus not develop behavior problems because of it. i know you have already fallen in love with her, but do what is best for her. jmho
lost