If she has water and shade and is with you and you aren't overheated, she's probably fine. I live in the "sunshine state" and mine have never had any problems. I usually get too hot before they do actually.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226