I understand that, if you aren't careful, a terrier will be your boss instead of vice-versa. You have to be consistent and fair.
Problem we are having is that Ducky wants nothing to do with Goosey. He is very angry at us right now. He has been an only child for several years. He will get over it, he still sleeps with us, while the pup is in his crate. I made sure I got him some new rawhides,and we are trying to get him involved with the playing. Hopefully he will come around soon. The pup on the other hand is obsessed with him, and keeps growling and whining at him trying to get him to play, very entertaining.