Dogma can change, but it takes a council as authoritative as Chalcedon, Ephesus and Nicea. Sexual morality arguments are not dogma, by the way. They are natural law teachings. Dogma is about what the Church agrees to (and Rome did after the fact, they were Aryan at the time of the great councils), not the Church thinking for us.

By the way, it was Dogma to never accept the priority of a long time gay companion in a Catholic hospital, instead favoring the family of origin and attempting to get the individual to recant his lifestyle while not letting him or her see the person they love most. The Catholic Hospital Association has recanted from such nonsense. Gay spouses now have priority (and it was the case before the law changed).