Wonder what's inside a dog's womb? This video from National Geographic will show you the stages of transformation of the puppy inside the dog's womb.
In the video, the key muscles like the jaw and the legs develop more rapidly than other muscles. These muscles are vital for survival of the animal once it leaves the uterus.
Also in the video, you'll see that the ears are clearly visible. The inner ear is already formed but the middle and external ear are still growing.