I searched and searched the internet for one like it and came up empty.  If there is one, it must have no tags, not even production tags and therefore the person who has it, has no idea what they have and can't list it properly.  Also, there are literally 100s of listings of the smaller version, this is the bigger verison and from what I can tell, the only one available on the internet.

The Aurora Flopsies series lists the bigger version as 12" and if you go from tail to hoof, laying down, this one is 12", but if you go from end to end (butt to nose), it is 10".  It is about 5" tall and 5" wide.