All the cattle; either of all sorts, or a very great number of them, as the word all is frequently used; or rather, all that were in the field, as it is expressly limited, Exodus 9:3, but not all absolutely, as appears from Exodus 9:9,19,25 14:23.
Related Commentaries of Exodus 9:6
Exodus 9:6
6 And the LORD did that thing on the morrow, and all the cattle of Egypt died: but of the cattle of the children of Israel died not one.