Animals have been used in warfare since humans first domesticated them. And dogs are no exception to the rule.

Since September 11, canines have taken on larger and more prominent roles throughout the US military, including within the Navy SEALs.

What's special about canine units used in the Navy SEALs is the particularity of their training.

All Navy SEAL dogs undergo an intensity of training that matches the difficulties of their human counterparts.

It's no wonder that these dogs have become vital components of SEAL team units.