Paladin's Mount: Called, Summoned, or Animal Companion that can teleport to you?

[Cheapy]

Which is it?

There's confusion over it, so I would appreciate a FAQing.

[InsaneFox]

FAQed! We shall get to the bottom of this mystery!

[Jeraa]

There is no duration on the mount, so it is an animal companion that the paladin can teleport to his location a few times per day.

[InsaneFox]

Called creatures don't have a duration. And not all summoned creatures have one either (see summoner).