Dog CPT and Taxonomy Plugin

<?php

/*
Plugin Name: Dog CPT and Taxonomy
Description: This plugin creates a custom post type 'Dog' and a custom taxonomy 'Dog Breeds'.
Version: 1.0
Author: CodeWP
Text Domain: codewp
*/

// Register Custom Post Type
function create_dog_cpt() {
    $labels = array(
        'name' => _x( 'Dogs', 'Post Type General Name', 'codewp' ),
        'singular_name' => _x( 'Dog', 'Post Type Singular Name', 'codewp' ),
    );

    $args = array(
        'label' => __( 'Dog', 'codewp' ),
        'labels' => $labels,
        'supports' => array('title', 'editor'),
        'public' => true,
        'has_archive' => true,
    );

    register_post_type( 'dog', $args );
}

add_action( 'init', 'create_dog_cpt', 0 );

// Register Custom Taxonomy
function create_dog_breeds_tax() {
    $labels = array(
        'name' => _x( 'Dog Breeds', 'Taxonomy General Name', 'codewp' ),
        'singular_name' => _x( 'Dog Breed', 'Taxonomy Singular Name', 'codewp' ),
    );

    $args = array(
        'labels' => $labels,
        'hierarchical' => true,
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'show_in_nav_menus' => true,
        'show_in_rest' => true,
    );

    register_taxonomy( 'dog_breeds', array('dog'), $args );
}

add_action( 'init', 'create_dog_breeds_tax', 0 );

// Populate the taxonomy with 200 demo records if empty
function populate_dog_breeds() {
    $terms = get_terms( array(
        'taxonomy' => 'dog_breeds',
        'hide_empty' => false,
    ) );

    if(empty($terms)) {
        for($i=1; $i<=200; $i++) {
            wp_insert_term(
                'Breed ' . $i, // the term
                'dog_breeds' // the taxonomy
            );
        }
    }
}

add_action( 'init', 'populate_dog_breeds' );