I'dsay it's more a case of recognising that there are more than one sort of dog. Here's an article I found on the netthat supports the broader use of the term, from which this quote comes:

"...comparing the depiction of Jews in Czarist Russia and pre-Nazi Germany with that of the Arabs in the United States in the 1970s and '80s. In both content and form the treatments given to each were identical. The two most prevalent German and Russian depictions of Jews paralleled the two most common images of the Arabs projected in U.S. cartoons."

But whether anti-semitism is limited to hatred against Jews, or also refers to hatred against Arabs as well is surely secondary.The important thing is to get rid of both types of hatred.