Use reasoning to lead to the answer of the following question:
Though it stayed strictly indoors, the small dog felt like it had all the space in the world in the what?
Options:
- living room
- dog park
- basket
- small apartment
- big house
 Reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
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. Therefore, the final answer is big house.