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Hi. My name is***** Thank you for your question. Diphenhydramine (Benadryl) is used very commonly for the treatment of allergies and in those with mast cell tumors. The inactive ingredients are not going to cause a problem for a dog. If your vet gave you a dose of Benadryl to use, I would feel very comfortable following through with it. I will have owners using Benadryl all the time for conditions I listed above. It shouldn't be a problem with the other drugs you listed.