Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE has_pet (petid VARCHAR, stuid VARCHAR)
TABLE: CREATE TABLE student (stuid VARCHAR, Lname VARCHAR)

### Question ###
Find the id of the pet owned by student whose last name is ‘Smith’.

### Accurate SQL ###

SELECT T2.petid FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid WHERE T1.Lname = 'Smith'