How sad! My neighbor's Yorkie was attacked by a hawk. Luckily the Yorkie was large enough not be carried away, but he had to have extensive surgery. The hawk's talons ripped through his mid-section.
This is why my boys never get to enjoy off leash time. Even on 30' leads, we often have hawks and black vultures (the kind that kill rather than scavenge) start circling and diving over us.