This seems to be a silly question, my 10 month old pup does not growl, even during tug of war games, cleaning ears, cutting nails, play fighting with other dogs. She does a lot of happy "talking" she's very very vocal, she's 3/4 lab 1/4 shepherd, is this normal? I'm with her 24/7, and not once has she ever growled. She greets everyone with a wiggling butt, some she's a little afraid of, so she'll squat down, tuck in her tail, but the back end is still wiggling, and it takes all of maybe two minutes to warm up to them, she's been in puppy classes since she was 7 weeks old and just finished her advance level 5 obedience and the others in there would play growl... she didn't... any idea's? Or thoughts?