How to re-egg a pet?

Does anyone know the requirements to re-egg a pet?

I heard they dont re egg anymore

Indeed. StS don't re-egg pets anymore.

That's why they added the second confirmation to open an egg...

They didnt re-egg and de-level anymore. Too many spam in Support.

Idk whether they still re-egg or not, but right now you can easily avoid opening an egg and regretting it.
You get the confirmation window before opening an egg.
You can slot BOTH your egg's happiness and its AA in one of your other pets to test them out, see if you like it.