Fact 1: Playing is one way mammals and other animals learn how to behave.

Fact 2: Dogs learn many social rules through play.

Given the two facts above, answer the question "How are dogs trained on how to behave?" with the following options: 
- Summer
 - during the day
 - By getting older
 - Movement
 - exercise
 - By sleeping
 - Through walks
 - Through play


 

        Through play 