A lot of families in Pakistan have dogs but are only limited to staying outdoors. Growing up I always "HEARD" that you cannot have dogs inside the house. I don't know that is a cultural thing or not.
So what the verdict on that one - can we have dogs inside the house?
Islamically, you can have a dog as long as it remains outside of your home or areas where one can or does offer prayer primarily due to najasat issues. Wudhu, namaz, etc.
When you do have a dog, you need to treat it well, feed it, take care of it, etc. All you have to do is be sure you clean yourself well before performing wudhu.