How to target a wolf

How do I make a wolf attack another wolf?

Code:
Mercenary:
MobType: WOLF
Disguise:
Type: Player
Player: '&7Mercenary'
Skin: Rvixs
Display: ''
Health: 20
Damage: 5
Equipment:
- leather_helmet:4
- leather_chestplate:3
- leather_leggings:2
- leather_boots:1
AIGoalSelectors:
- 1 shootbow
- 2 meleattack
AITargetSelectors:
- 0 clear
- 1 monsters
Skills:
- skill{s=ChangeWeaponSword} @Self ~onTimer:5
- skill{s=ChangeWeaponBow} @Self ~onTimer:5
-...

How to target a wolf