Pre-CK mod...

It's a creature named after your son, who follows you around. 

Open console and click anywhere to select a random refid. Can not be player or other npc refid. Alternatively go to Vault 111 exterior and click on the radstag in console
Use the console command :

For deathclaw:

"bat shaunclaw" 

and again

"bat shaunclaw" 
--------------------------------------------------------

For yao guai:

"bat shaunbear" 

and again

"bat shaunbear" 
--------------------------------------------------------

For gen1synth:

"bat shaunbot" 

and again

"bat shaunbot" 
--------------------------------------------------------

For gen2synth:

"bat shaunbot2" 

and again

"bat shaunbot2" 
--------------------------------------------------------

For cat:

"bat shauncat" 

and again

"bat shauncat" 
--------------------------------------------------------

For Mutant Hound:

"bat shaunhound" 

and again

"bat shaunhound" 
--------------------------------------------------------

For super mutant behemoth:

"bat shaunmoth" 

and again

"bat shaunmoth" 
--------------------------------------------------------

For raider dog:

"bat shaunraiddog" 

and again

"bat shaunraiddog" 
--------------------------------------------------------

For gorilla:

"bat shaunrilla" 

and again

"bat shaunrilla" 
--------------------------------------------------------


For radscorpion:

"bat shaunscorp" 

and again

"bat shaunscorp" 
--------------------------------------------------------

For vicious dog:

"bat shaunvicdog" 

and again

"bat shaunvicdog" 
--------------------------------------------------------


to get Shaun(the creature)to follow you around. 

Fast travel somewhere for the creature to appear if it isn't there already.

If it still a radstag, click on it and run again. After that it SHOULD be the creature you want.


To load the mod into the game edit this file:

C:\Users\<Your windows user name>\AppData\Local\Fallout4\plugins.txt

...and add Shaun.esp to the list of mods to load. Make sure to mark the file as read-only after you edit it!

or Use a mod manager.