"Measles" these days refers to Rubeola. What we normally call "German Measles," Rubella is less severe. Rubeola is a solely human disease, so the sow probably had something else.

I can find little information about smallpox. Since the last naturally-occuring case was in 1977, authors of modern medical books, or at least the one I have, don't seem to spend much time on it. I know there are various "poxes," and some certainly infect animals. I believe the vaccine was made from one of these less-severe-in-humans strains, the "vaccinia virus." I've got a medical book in a box in the basement published in 1908, but there's little hope of locating it this year.