Available choices: [I] Heart rate; [II] observe it; [III] sight; [IV] hormones; [V] waves; [VI] touch; [VII] hearing; [VIII] smell;
Given those answer options, answer the question: Fact 1: Hearing is used for sensing sound by animals. Fact 2: By nature, dogs are pack animals. Given the two facts above, how do dogs sense sound?
A:
[VII]