I have a 4 year old border collie. He is the most placid dog you could wish for, or was until recently. I lost my husband 6 weeks ago, he and Harley spent most of their days together and doted on each other. For the last few weeks he has started to take a dislike to men that he has not met, usually he will go to anyone to be petted but he growls and cowers and doesnt want them anywhere near him. It must be related to the death of my husband but I can not figure out how and why. Can anyone shed any light on this?