Chloe, my currently three year old Australian Shepherd/Collie mix, has had this problem since she was a puppy. Whenever she greets another dog, she always does the proper sniff greeting, but then she just explodes into a growling/snarling mess. It doesn't matter how calm/annoying/submissive/dominant the dog is being...unless it is a puppy, she WILL growl at it. She has made great strides in ignoring other dogs (as she used to trigger at just the sight of another dog and if it got too close she would growl/lunge). Now this only happens when she is greeting. Just today, for example, we have had three incidents. #1. Passed a Boxer by on a trail at the park. The owner was standing still holding the dog, we were walking by. I didn't get a good look at the Boxer's body language as I was focusing more on Chloe, but I'm assuming it was being friendly from the way his owner was saying, "No, you can't play with that dog." Chloe was being cautious, but nothing aggressive. She sniffed noses with it in passing and then three seconds later exploded with growls. I just tugged her with me (she was wearing a harness) and continued walking by. #2. Came across a loose Dachshund at the park. The Dachshund was very calm, friendly, and after the initial sniff pretty much just ignored us. When she came up to Chloe, Chloe sniffed for a few seconds and then growled. I grabbed Chloe by the muzzle and jerked her face up to break eye contact and my brother stepped between the two dogs. The Dachshund was cool with it and just followed us around. Once I let Chloe loose again she completely ignored the Dachshund. She was comfortable with it around and didn't do anything to it - much like the Dachshund was doing with her. #3. A friend of the family brought out to the house a littermate of Chloe's that she just adopted over the weekend. The dog's name is Lacey. She is very calm, has no qualms around other dogs, and while she isn't belly up submissive she also isn't dominant either. Chloe was VERY excited to go and meet Lacey. Loose wagging tail, whining, etc. Nothing aggressive or defensive about her posture at all. Maybe anxious or over stimulated, but not aggressive. We had the dogs on leash and let them greet. They each went side by side and proceeded to sniff one another. A few seconds went by and all was well and then Chloe exploded. She tensed a split second before she did, but that was the only warning. I jerked her back, Melissa reeled Lacey in (who didn't react to Chloe's explosion), and I had Chloe sit. Chloe tried to lunge one more time (to which I grabbed her muzzle and broke eye contact) and then resumed her normal stance and acted like she wanted to go greet Lacey again. We didn't let them, but I did give Chloe full run of the leash and she just seemed inquisitive. Chloe ALWAYS does this. It isn't unique to these situations. Even in puppy kindergarten she would growl/lunge at the other puppies when they would try to greet her or she them. She'd seem fine, then she'd just explode. She isn't dog aggressive (she has never attacked another dog before) and once she makes a doggy friend she loves to play. Typically after a few introductions over a span of a few days she is happy to engage with the other dog. Since she does get along with dogs after a few introductions and is fine with puppies, I really don't mind (considering almost all of my dogs have had dog/dog issues of one flavor or another), but it is just really annoying! I'm sure she feels insecure and that is why she reacts, but I have no idea how to go about fixing the problem. People always say, "Just let her meet more dogs to increase her confidence!" Um, no, that isn't working. It just reinforces this exploding behavior since she is allowed to do it every time she greets another dog. This has been going on for three years now and I don't even know where to begin to fix it. Most of the advice I have gotten on this issue has helped greatly with her ignoring/tolorating other dogs nearby (which she now does very well), but it hasn't touched the greeting issue. Anybody have any ideas?