Gypsy, the Equine Encyclopedia, has something to say about the canter. Like all shetlands, she is always watching, listening and learning.
The canter is a 3-beat gait that is faster than the trot and slower than the gallop. The average length of stride is 10 to 25 feet (much shorter for 11.3 hand ponies) and the canter has a period of suspension (all feet off the ground at once). It is about 12 miles per hour and takes a lot of effort, so ponies hate it and become tired very easily.