First Yodel
Sam and I spend time every day holding the pups and petting them.  Last night as Sam was holding Chili and petting him, he yodeled!  It startled both Sam and I since it was totally unexpected.  Chili can be very loud but is not usually too vocal.  Pep vocalizes frequently but they are quieter sounds.  When I hold him he makes quiet happy sounds, he is also vocal when nursing.  Sophie is the only one who does not really vocalize.