Common side effects associated with using Benadryl for dogs include:
Drowsiness.
Dry mouth.
Urinary retention.
Hypersalivation.
Increased heart rate.
Rapid breathing.
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The effects of the medication typically last for around 6-8 hours. Liquid Benadryl is typically recommended for dogs weighing less than 10 pounds, as this can make it easier to achieve an accurate and appropriate dose.