Mastiff

Mastiff CR: 1/8 (25 XP)

Medium beast, unaligned

Armor Class: 12

Hit Points: 5 (1D8+1)

Speed: 40 ft

STR

13 +1

DEX

14 +2

CON

12 +1

INT

3 -4

WIS

12 +1

CHA

7 -2

Skills: Perception +3

Senses: Passive Perception 13

Challenge Rating: 1/8 (25 XP)

Keen Hearing and Smell. The mastiff has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Pack Tactics. When the mastiff has advantage on attack rolls against creatures within 5ft. of one of the mastiff's allies that are not incapacitated
Loyal. While within 30ft. of an ally that it can see, it has advantage on saving throws against being charmed or frightened.

Actions

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) piercing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone.