Bein

Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The wolf has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally isn't incapacitated.

Pack Animal. If left with the mounts, Bein will fiercely protect them. Any attack against the mounts must be taken at disadvantage, and they have advantage on saving throws when targeted. 

Fetch! As an action, you can point at a small item that Bein can reach and shout 'Fetch!' As a reaction, Bein can then move a maximum of 80ft in one turn to retrieve an item and deliver it to whoever says the command. The item must be something a dog can reasonably carry. Bein will then be on the field, and wil ahve a 50% chance of returning to the mounts on your next turn, or being distracted and staying next to you.

Beware the Dog. During an owner’s long rest, any enemy or potential intruder within 60ft. must make (or repeat) a Dexterity (Stealth) check at disadvantage. On a fail, the dog wakes up and uses its bark to alert all allies within 120ft. This takes the dog one action

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.