I have always had dogs. I have four now; 9 yr old Boston Terrier (inherited from my father in law who passed) 12 year old Australian Blue Heeler, 5 year old female pit bull and Lucy, 2 year old CC. I have also had GSD and other small dogs. All are rescues. Lucy was around 18 months when I got her and she is a joy, truly. My question is this... my pit is very submissive (they get along great) and when loving on the pit she likes to .. only way to describe it is "purr" . She kinda moans when someone in the family loves on her and its adorable. The Pit and Lucy are very close and lately when I love on Lucy she starts to growl a little. She doesn't show ANY sign of aggression when she does it. I am not rough housing with her.. literally just petting and scratching her down on the floor with her. It is the only time she gets vocal like this and its a bit disconcerting.. anyone have experience with this kind of vocalization? I understand these dogs are different than other breeds and I am trying to keep that in mind with her. Anyone?