Though it stayed strictly indoors, the small dog felt like it had all the space in the world in the what?\nOptions:\n- living room\n- dog park\n- basket\n- small apartment\n- big house
Let's think step by step below.
big house
In big house, the small dogs stayed strictly indoors.

The small dog felt like it had all the space in the world in the big house.

.

Final answer: big house