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The dosage range for cephalexin (KeflexÂ®) is most often 22 to 33 mg/kg. Great Danes are big dogs as you know (weight range can be 110 to 160 pounds). Let's say your dog weighs a modest 110 pounds. They would be roughly 55 kg. 55 kg x 22 mg/kg = 1210 mg or if they used the 33 mg/kg = 1815 mg.
*rolls eyes* Tums are acceptable to give to a dog for an upset stomach, but only as a temporary alleviation of symptoms until you can get to the vet ASAP. It's also better to administer no more than 30ml of Milk of Magnesia rather than give an antacid tablet.