The first is called "The Curse of King Mutt" and the second is called "Bored of Education". They'll both premiere October 7, 2011 at 8pm ET.
UPDATE: There are now FOUR new episodes, coming a few days later on October 10, 2011. This includes the two listed above, as well as the episodes "Guard Dog" and "Dog Save the Queen" afterward. They will air from 10:00AM to 11:00AM ET.