Before we even ask “tame,” we need to be clear what The Deer is in this game world, how the mechanics treat it, and what the developers' intent seems to be.

The Deer is the main antagonist in 99 Nights in the Forest.
It appears only at night, hunting players who leave the safety of the Campfire area.
In lore, it is connected to cultists, and has been shown to kidnap missing children and hide them in forest sites.
Visually and behaviorally, The Deer is monstrous: tall, with enlarged eyes, claws, and a posture that shifts between bipedal “stalking” and quadrupedal “running.”
Importantly, The Deer is immune to all damage. Weapons, traps, and blueprints do not harm it.
The only interaction mechanics allowed are stunning with light (flashlights), and delaying or evading it.
As players stun it, The Deer becomes more resistant over time (i.e. repeated stuns have diminishing effect).
The Deer avoids or flees from bright lights (flashlight, campfires) and will not approach directly around the Campfire.
Thus, The Deer is explicitly designed as an invincible predator — a fixed threat rather than a character you can fight or convert.
One interesting wrinkle: in the update log for 99 Nights in the Forest, there is mention of a “Taming Update” (October 4, 2025), stating:
“Animals can protect and guide you if you have pets of your own! More details coming soon.”
This implies that in future or upcoming versions, there may be a way to interact with (some) animals more deeply — perhaps domesticating or having friendly creatures assist you. But there is no indication (so far) that The Deer itself can be tamed, turned friendly, or controlled. The “pet” system seems aimed at lesser forest animals, not the main antagonist.
Given the developers' design of The Deer as an antagonist and the explicit statements about its immunity, it seems unlikely that it can be “tamed” in a conventional sense. The update hints should be watched, though — the mechanics may evolve.
From both gameplay and community evidence, trying to tame The Deer runs into several major obstacles:
In short: there is no legitimate or intended way (as of current stable game state) to tame the Deer in standard play.
If you're focused on progression instead of chasing myths, it's better to invest your time in survival gear, lighting upgrades, and resource gathering. Diamonds remain one of the key currencies for unlocking advanced tools and cosmetic items, so planning your resource routes early helps a lot. For those seeking a quicker route, you can always buy 99 Nights in the Forest diamonds to stay ahead during the toughest nights.
Even if you can't befriend The Deer, you can learn strategies to manage encounters so that The Deer becomes less of an imminent threat.
So, can you tame The Deer in 99 Nights in the Forest? Based on current mechanics and developer design, the answer is no — The Deer is explicitly invincible, immune to harm, and intended as a perpetual threat, not a creature you can convert. What you can do is learn how to survive, evade, and mitigate its dangers through smart use of light, terrain, barriers, and defensive planning.
That said, the recent “Taming Update” hint does open a small possibility: future patches might expand pet mechanics or offer new interactions. But even then, I'd bet The Deer remains off-limits for “taming.” It's too central to the game's fear and tension.