This question has also been asked and answered here: How much Benadryl can I give my dog?
Benadryl is an antihistamine. Its active ingredient is diphenhydramine. Diphenhydramine can be given to dogs for a variety of reasons. It can be used for allergic respiratory disease, cough, pruritis (itchy skin) due to allergy, motion sickness, and mild sedation. It should not be used if your dog has urinary retention, glaucoma or hyperthyroidism. Side effects include drowsiness and CNS depression (Impaired thinking and perception, decreased heart rate, slow breathing)
The general dose of Benadryl (diphenhydramine) is 2 to 4 mg/kg up to three times day.
You should consult your vet before giving Benadryl to your dog.
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