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Hello and welcome,
How long ago did she eat this?
Was it a 25 mg one? How much of it did she have?
How much does she weigh?
I am sorry that you have been waiting for a response. I recently just logged onto the site and noted that your question hasn't yet been answered. I am a licensed veterinarian with over 25 years’ experience and would be happy to work with you if you are still needing assistance.
I suspect that by now she is no longer drooling. The dose of Benadryl that she received is not a toxic dose, but the pill can be bitter and that may be what led to the drooling.
If you want to give me an update or if you have any further questions, I would be happy to comment further.