<h4>Pet Registry SQL Fix</h4><ul><li><strong>Fixed:</strong> Fatal SQL syntax error on page load — getDistinctBreed() called without petid on initial load ($.get_distinct_breed() with no argument). When both petid and ids are empty, the SQL became "WHERE PetType IN()" which is invalid MySQL. Restructured the method to check petid first, then ids, and return empty array if neither is available. Also cast petid to int to prevent SQL injection.</li></ul>