When you open the debug overlay (F3) while looking at your horse you get this:

All you need to know about your little baby can be seen now.

(In 1.2.1+ version)

You can get a 3d overlay of the stats, the mod will mark with a star the better stats in a 64 blocks radius, a star on the top is for the best overall stats.

You can toggle this option by setting a key in the key binding.