Acadian, I’ve been working on my Ulfe mod and I found something to check for your conjured critters who can’t follow through doors. Open their race and look under the General Data tab. In the middle there’s a check box for Can’t Open Doors.
Now here I must emphasize that I don’t know if allowing the summoned canines to open doors will let all of the wolves of Skyrim enter buildings. In my mod I made a separate race for Ulfe to avoid such exciting surprises.

Anyway I hope that helps!