Best way to set an animals name

I'm trying to figure out how to make it so players can name there animals having trouble in a few parts

one I'm not sure how I would make it so when players do a command its that animal that they are changing since I'm using the listener class to do so

another I'm wondering is if there is a simple way to do this with the new object name change thing

 

The docs are not updated yet, so I don't believe there are methods to set the tag. You will need to use reflection.

"What is reflection"

You might need to do a bit of research

 

There are methods for this in the LivingEntity class. I got this all working editing the nbt without even checking for api since they're usually so slow, lol.

entity.setCustomName(String);

I've not tested it, tho.