This can be stated in the active form. Alternate translation: "because all the beasts in the fields steal my flock and eat them" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Here "all" is a generalization that refers to all the wild animals that eat sheep. Alternate translation: "all the wild animals in the fields" (See: [[rc://en/ta/man/translate/figs-hyperbole]])