Every time I see a picture of a Lab and the word puppies it makes me one one. Dang, I wish I was in a position to have one.... Not right now, so I wish you'd stop tempting me!!!

Probably Ultrasound. That's what they do to look at the unborn. X Ray are really only good at looking at bones and radioactive isotopes (or what ever they inject into you), and I doubt those puppies are radioactive.