xoxoxoBruce gets these images and does a lot of work seeking out the source, but there is no source. A
flickr page where the shots seem to have come from simply says "i do not know who took this - was sent to me by my dad".
xoB found a hunting forum where the pics were posted; when I went to the general index of threads there, the pics were posted a
second time, this time saying that "These pics were taken near Indianapolis, apparently Momma Deer went out for lunch, and little Spotty latched onto the first warm bodies it could find. After the horses moved on, Momma Deer came back and retrieved Spotty, all ended well."
So if anyone has better source info, let us know. Meanwhile,
xoB also finds this unrelated, second horse and fawn image. And this one has a
great story you will surely want to read.