Help parsing an XML feed

I am trying to parse an XML feed into an array for feeds integration and would like some help seeing where I am messing up.

not full code

$result = simplexml_load_string($string);
    
    
    // this will iterate
    
    $item = array();
    
     foreach ($result->xpath('pets/pet') as $pet) {
    $item['guid'] = (string)$pet->id;
    $item['animal'] = (string)$pet->animal;
    foreach ($pet->xpath('breeds/breed') as $breed) {
          $item['breed'][] = (string)$breed->breed;
      }
    $item['mix'] = (string)$pet->mix;
    $item['age'] = (string)$pet->age;
    $item['name'] = (string)$pet->name;
    $item['shelterId'] = (string)$pet->shelterId;
    $item['size'] = (string)$pet->size;
    $item['sex'] = (string)$pet->sex;
    $item['description'] = (string)$pet->description;
    $item['lastUpdate'] = $pet->lastUpdate;
    $item['status'] = (string)$pet->status;
___________