Should I think of Indoor dog house for my little Chihuahua?

Yes, I have two dogs and they love to sleep in their own house. If you want her to keep in home and don't like damage your furniture and carpet by your new dog then its a great idea.
Also a good comfortable indoor dog house will make your dog happy and will not disturb you when sleeping and enjoy living in the comfortable place.
Here you will find the best ideas for indoor dog houses and tips to choose best indoor dog house for your dog.
http://atozpetcare.com/tips-buying-indoor-dog-house/

Ya sure. I have two little puppies and they love and feel comfortable to sleep in their own house. Recently I purchased two new cute home Alabama Dog House for them from Posh Puppy Boutique store. And I think they are very happy with their new home. So you should also do it and I am sure he will definitely like his home.