Size Command

I need help making the size command to a private server.

I used the /size command from another help request wich works like this
/size (Name) (PlayerOrPet) (Size)

The command works if i look up or down but if i look left or right it goes back to normal.

Thanks in advance.

EDIT: Got it working by myself

@Ahlwong @Raple OP fixed his problem.