Sorry to add one problem with another, my dog has just lately taken a dislike to my 5 yr old son, he has absolutely no problem with other children, I have another 3 and of course their friends are round often, he doesnt do it all the time but he often growls if Israel(my son) just walks past him and some times if he strokes him. He doesnt move he justs growls. I was thinking maybe cos he is my youngest and I show him the most attention maybe he is jealous - do dogs get jealous? He has made no attempt to bite him or been in no way aggressive apart from the growling? I have only had him for a few months and he is only 1yr. Should I be worried?