Lucky is a relative concept, but this dog apparently made it out alive.  Its story will be added to the Kittens, Puppies and Ponies page:

...We gather in a little band of thirty or forty around our colonel. What is next to be done? Over yonder near the old barn they are getting a new battery into position to enfilade us. It is a part of Lee's forces that have just got back from the right. Comrades Billy Gates, Bob Hamilton, and myself, form ourselves into sharp-shooters, and try to pick off the gunners. Bob's little yellow dog has come into the fight with him, and is jumping around, yelling and barking, as if fully alive to the importance of the situation.  Suddenly a yip and a yell tells us the dog is hit. Bob drops his rifle, grabs and hurriedly examines the dog. A ball has skipped across his back and burnt off the hair, that is all (pp. 288-289).
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Forty-six months with the Fourth R. I. volunteers, in the war of 1861 to 1865 Corp. Geo. H. Allen, of Company B.  1887.