Warning: This blog post includes images of a mare’s vulva to illustrate normal foaling behaviour.

15th May 2017
Tilly isn’t looking impressed with a beautiful sunrise this morning…
Relaxation of the vulva
– Within the last 24-48 hours before foaling the mares vulva can be observed to swell and relax in preparation to stretching several times it’s normal size to allow passage of the foal. Read more at http://horsetalk.co.nz/2012/10/17/foaling-in-mares/#huLhOvMaPbiUdyum.99

Photo on the right is this morning (15th May 2017)