I was goofing around with Sadie earlier because she was sitting on the other end of the couch ignoring me, so I was calling her by all different names - Sadie-Boo, Sadie Jones, a bunch of others... and then I called her Jenny's last name, and she jumped up and came over, so we decided that she must have secretly eloped with one of Jenny's dogs.
We'll have to congratulate Cisco or Linus next time we see them.