Please keep a close eye on both pigs. Flour has just been exposed to Rosie's URI and can give it to your new pig. Or, your new pig from the store could have a different type of URI, and manage to give it to Rosie.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry