Suspect i.r. mare shivering

Jonni Jump

My suspected i.r. mare has been shaking when it's cold and raining she has never been like that in the 10 years I have had her. 
I am blanketing her now when it gets below 40 and rain.
She has access to free choice hay and tree for shelter.
Would that be a symptom should I test her ACTH?
Jonni Jump
June, 2018
Augusta Ga.
Mirage i.r. friesian/ssh mare 

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