getting a new inside dog when i have one who lives outside

I have a black cross of an Irish settee and a pie dog called TIPSY. she is 4 years old. She has been trained from childhood to stay out of the house. She has her own kennel type room , she never enters the house. she always stops at the door.
we are planing to get a pug. A pug being an inside dog, we are in a dilema, as to how TIPSY will take it. Should we start bring TIPSY inside the house or will she take it sportingly. Also the pug will get a lot of attention... please help with some advice