Tips on Customizing Pets

How to Hide Pets Admin Menus

function plt_hide_pets_menus() {
	//Hide "Pets".
	remove_menu_page('edit.php?post_type=pets');
	//Hide "Pets → All Pets".
	remove_submenu_page('edit.php?post_type=pets', 'edit.php?post_type=pets');
	//Hide "Pets → Add New Pets".
	remove_submenu_page('edit.php?post_type=pets', 'post-new.php?post_type=pets');
	//Hide "Pets → Breed".
	remove_submenu_page('edit.php?post_type=pets', 'edit-tags.php?taxonomy=breed&post_type=pets');
	//Hide "Pets → Colors".
	remove_submenu_page('edit.php?post_type=pets', 'edit-tags.php?taxonomy=pet-color&post_type=pets');
	//Hide "Pets → Sponsors".
	remove_submenu_page('edit.php?post_type=pets', 'edit-tags.php?taxonomy=sponsors&post_type=pets');
	//Hide "Pets → Locations".
	remove_submenu_page('edit.php?post_type=pets', 'edit-tags.php?taxonomy=pet-locations&post_type=pets');
	//Hide "Pets → Settings".
	remove_submenu_page('edit.php?post_type=pets', 'pets-settings');
	//Hide "Pets → Fields".
	remove_submenu_page('edit.php?post_type=pets', 'pets-fields');
	//Hide "Pets → Upgrade".
	remove_submenu_page('edit.php?post_type=pets', 'pets-pricing');
}

add_action('admin_menu', 'plt_hide_pets_menus', 1000000000);

Where do I put this code?

How to Hide Pets Meta Boxes

function plt_hide_pets_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Information" meta box.
	remove_meta_box('pets-fields', $screen->id, 'advanced');
	//Hide the "Pets" meta box.
	remove_meta_box('pets-sponsors', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_pets_metaboxes', 20);