Your loyal hound is always at your side. It uses the Hound stat block and the following rules.
The Hound in Combat
In combat, your hound acts during your turn. It can move and use its Reaction on its own, but the only action it takes is the Dodge action unless you take a Bonus Action to command it to take an action in its stat block or some other action. If you have the Incapacitated condition, the hound acts on its own and isn't limited to the Dodge action.
The Hound Dropping to 0 Hit Points
If the hound drops to 0 Hit Points, it has the Unconscious condition until you finish a Long Rest or it regains any Hit Points. When you finish a Short or Long Rest, it regains all of its Hit Points and loses this condition. See the sidebar "Does the Dog Die?" for information about losing or replacing your hound.
[stat block: Hound]