My neighbors have 2 golden retrievers. They're are brothers, got them at the same time as puppies and are now 9 years old. Love the dogs and always go and say hi to them and play w/them when they're out. One of them however, will come over to me if I'm sitting down and of course, I start petting him. He's fine for a minute or two then will start doing a low growl. It never gets to be really loud and he never has snapped or tried to bite me and he always wants me to pet him if I stop. I have to admit though, that when a dog growls at me, I pay attention. His brother never does this and they would both be in your lap if they could. At first I thought he was just talking but I'm really not sure what is going on. Is it jealousy because of his brother? I've tried to notice if he does it if the other dog isn't there but where one is, the other usually is. I'm not really afraid of him but I certainly respect that fact that he is growling. Anybody heard of this?