Ahhhhhh! You Found It!

I have yet to meet a horse who doesn't have that certain "spot" on their body that, when scratched, elicits hilariously goofy faces.

 Abby will tilt her head and begin working her lips when I scratch hers.

 Her eyes half close in ecstasy as she enjoys the attention, and sometimes she even leans into me.

 "Thank you! I feel much better now!"