We had a GSD rescue several years ago that would talk to us...woo woo woo. He woo woo woo'd at the vet once when he got shots as if to say "what did you do that for". I just loved when he would woo woo woo. It was so cute. One time hubby and I went out of town for a few days and left our kids in charge...well when we got home that dog ran back and forth to my husband and then to me just woo woo wooing up a storm as if to say.."where have you been, I am so glad you are home, I missed you. don't leave me again". Oh how I miss that boy.