T-Dog is a Bruiser hero, with the following Leader trait:

Beat Em Up

At the end of the enemy turn, T-Dog attacks a random adjacent enemy for X% of total damage.
Beat Em Up and Punish traits stack as two separate attacks.

As a leader, Scouts, Bruisers and Warriors gain this bonus.

Notes:
• Both traits only work for adjacent enemies, so you won’t hit an enemy 2 spaces away even if you have extended range weapons equipped. However, with such weapons, you are able to hit multiple enemies depending on your positioning to the target