SWINE FLU?

QUESTION: WHY ARE THEY CALLING IT SWINE FLU, AND NOT PIG FLU

SWINE MEANS PIG SO WHY NOT CALL IT PIG. MOST ANIMALS DON'T HAVE ANOTHER NAME THAT IS ALSO A DEROGATORY TERM FOR HUMANS EXCEPT FOR DOGS.

SO I GUESS IF THERE WAS A DOG FLU THE MEDIA CALL IT BITCH FLU?