Mary, I had the exact same problem with a young horse I brought to
California from Oregon....I started grinding Flax seed and worked up to about
a cup a day....no more hives, nor more weeping pustules. I did
experiment and cut off the flax seed...the hives came back. Reintroduce
the flax seed = no more hives. I think grinding it freshly is key.
I hope you try it (and let me know if you do). It sure gave my
"baby" complete relief.