Data Tag In summon Command

I Test For /Summon Command
i do /summon pig ~ ~1 ~ {CustomName:"Pig #1483",Riding:{id:Pig}}
I Wanna To Riding Pig With Pig
But I Cannot
The Pig Has Summoned But The Data Tag : Riding
Not Work Just The CustomName
And Some Data Tags Not Work
In Last Update Like 1.8 Is Work %100