A year ago National Geographic did a series on "In the Womb: Animals" building on its highly successful human "in the Womb" series. They're going to show it again on May 25, and it's pretty darn cool. You can see a preview here and the RT-Image story is below witha full link to the article.
Quoted from http://www.rt-image.com/content=9104J05C485E8E8640569A7244A880441:
Ultrasound Gone Wild
Imaging animals in the womb
By Amy Storer
Article available online at: http://www.rt-image.com/0521ANIMALS
For years, traditional 2-D ultrasound images have given expectant mothers a window – albeit a grainy, black-and-white window – into their wombs. Now, advanced 4-D ultrasound technology provides a clearer picture and produces video of the moving fetus.
In 2006, using this 4-D imaging technology on pregnant human mothers, the National Geographic Channel (NGC) aired a special production titled, "In the Womb." Building on the interest generated from that production, NGC recently developed a two-hour show featuring expectant mothers not in a human's doctor office, but in a veterinarian's office, instead.