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This should work on both 1.13 and 1.14, and is not limited to ‘tamable’ mobs, either. So even if you have a pet squid or slime this will work on them!

If you’re playing singleplayer: start by going into the escape menu and clicking “Open to LAN”. Once you are in there, enable cheats, and then press open. Once that is done, run the command seen below via copy/paste.

If you’re playing multiplayer: you must the server admin or an op, then just run the following command by copy/paste.

/data modify entity @e[name=“<Pet Name>”,limit=1] Invulnerable set value 1

Obviously, replace “<Pet Name>” with whatever you have named them via a nametag. If it works, you will get the following message.

Now nothing can kill your pet!

Bonus: if you cannot find your pet, simply type:

/tp @e[name=“<Pet Name>”] <Your Username>

However, you must be close to where you lost them, because it won’t work if they are in an unloaded chunk.

Enderman: *looks at player’s eyes*

Player: 01010010 01100001 00100000 01110010 01100001 00100000 01010010 01100001 01110011 01110000 01110101 01110100 01101001 01101110 00100000 01101100 01101111 01110110 01100101 01110010 00100000 01101111 01100110 00100000 01110100 01101000 01100101 00100000 01010010 01110101 01110011 01110011 01101001 01100001 01101110 00100000 01110001 01110101 01100101 01100101 01101110 00100000 01101111 01101000 00100000 01100110 01110101 01100011 01101011 00100000 01100001 01101110 00100000 01100101 01101110 01100100 01100101 01110010 01101101 01100001 01101110