When we first got our saint he had a time adjusting. He had been raised in a home with toddlers, then was fostered in rescue, and then came home with us where there were no babies. And then he had to get used to our rottie. It took him quite a while to accept all the changes, but after about 6 months he seemed to realize that we were not going to "ship him out" again. He has been fine every since. Some dogs are just more sensitive to change. He will settle in..... :D