Razor Wool. A creature that touches the Abyssal Sheep or hits it with a melee attack while within 5 feet of it takes 16 (3d10) slashing damage.

Demonic Charge.  If the abyssal sheep runs in a 20 foot straight line towards a creature and then uses its tackle attack at them that attack is made with advantage.  If the creature is prone then the Abyssal Sheep can make a bite attack as a bonus action.

Multiattack. The Abyssal Sheep can make three Bite attacks one with each head.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit. 7 (1d6+4) piercing damage. The target is grappled (escape DC 15) if the target is huge or smaller.  If a creature is grappled that head can only bite the grappled creature.

Tackle.  Melee Weapon Attack: +8 to hit, reach 5ft., on target. 27 (4d10+5) slashing damage.  The target is knocked prone if it is huge or smaller.