The skull of Jobaria is built of very fragile bones. The back part of the skull that surrounds the brain (called the braincase) is the most robust. Both adult and juvenile skulls preserve the braincase. In the case of the adult the space in the braincase is roughly equivalent to the size of a baseball.

The skull has very large openings for the nose and eyes. As you can see from the flesh reconstruction, the actual opening of the nose (nostril) and the diameter of the eyeball were considerably smaller. Jobaria probably had a keen sense of smell and hearing.

Jobaria's spoon-shaped teeth are similar to those of the earliest sauropods. No other Cretaceous sauropod is known with spoon-shaped teeth. They were well adapted to nipping the leaves and branches of trees.