How to get feline pets to ride on the Druid Travel Form back (World of Warcraft: Legion)

If you play a druid and have a feline / cat pet, you can actually invite it to ride on your back while you are in travel form! Any feline pet will do this with any travel form, and all you need to do is summon the pet, go into travel form and type /sit. This will make the cat jump and sit on your back while you travel