It costs $2.80 for a child and $5.50 for an adult to catch the bus in Rangiora.
But there was no charge for Nismo the five-month-old puppy, who snuck onto a Metro Blue Line bus on Southbrook Rd headed for Christchurch.
The pooch led bus users on a chase around the bus as he craftily evaded capture.
Fortunately after a brief ride on the bus, which goes from Rangiora into the city, Nismo was guided off.
He then took off around Southbrook School grounds, before finally being collared and taken back home by animal control.