  Quantized vortices are the prototypical feature of superfluidity. Pervasive
in all natural systems, vortices are yet to be observed in dipolar quantum
gases. Here, we exploit the anisotropic nature of the dipole-dipole interaction
of a dysprosium Bose-Einstein condensate to induce angular symmetry breaking in
an otherwise cylindrically symmetric pancake-shaped trap. Tilting the magnetic
field towards the radial plane deforms the cloud into an ellipsoid through
magnetostriction, which is then set into rotation. At stirring frequencies
approaching the radial trap frequency, we observe the generation of dynamically
unstable surface excitations, which cause angular momentum to be pumped into
the system through vortices. Under continuous rotation, the vortices arrange
into a stripe configuration along the field--in close corroboration with
simulations--realizing a long sought-after prediction for dipolar vortices.
