Q. My dog has been gagging for the last month. The vet said try Benadryl, we did but he is still gagging. The only thing that comes up is white foam

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A. This might be a type of coughing rather than gagging, a heart problem need being ruled out (heart failure/ heartworm). Did your vet see the actual "gagging? if not try to take a video when it happens, this way he could confirm if it is gagging or coughing.

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