Laravel 5.1 - Can't access Auth:user()->data from my controllers

I've been having a little trouble with Auth data in Laravel 5.1 I want to get the id of the Logged user and It works if I use it in a View, lets say:

<?php echo Auth::user()->id;?>

But if I try to access to it in a Controller it dowsnt work, and I get this error:

ErrorException in Con_Mascota.php line 101:
Trying to get property of non-object

In line 101 i've:

$cod_usu=$request->user()->cod_usu;

I changed that from $cod_usu=Auth::user()->cod_usu; cause that didnt work either.

Im also including it in the Controller:

use Auth;

Any help is much appreciated :)

via Chebli Mohamed