I was from Cape Cod also. Got my first sheltie there from Mrs. Ruth Lane breeder. He was the best sheltie. I am on my third sheltie and they all are different. The male I have now is two years old and is also a barker. My vet wanted me to put him on Prozac when he was younger and I declined. She said it would calm him down . He is very aggressive toward people coming into the house. I can't seem to break him of that habit. Barks at people going by. Used to chase cars until he got loose and actually ran into the wheel of a van. Fortunately he only got his paw damaged and had to have stitches . No more chasing cars. Still would like to see him not be so aggressive to people coming into the house. Any suggestions.