Quick Answer: Can Too Much Benadryl Harm Your Dog?

What are the potential effects if a dog consumes an excessive amount of Benadryl? Ethanolamine-based antihistamines, like Benadryl, can lead to various symptoms in dogs when taken in excess. These signs typically manifest within an hour of exposure and include heightened activity, lethargy, excessive drooling, rapid breathing, and an elevated heart rate (10). In cases of overdose, dogs may also experience dilated pupils, dry mouth, confusion, and a rise in body temperature, resulting in fever (10). It’s crucial for pet owners to be aware of these symptoms and seek immediate veterinary care if they suspect their dog has ingested too much Benadryl.

Determining the appropriate Benadryl dosage for dogs is essential for their safety and well-being, and it largely hinges on their weight. Smaller dogs should be administered a significantly lower dose compared to larger ones in order to achieve the desired therapeutic effects without risking harm. According to the Merck Veterinary Manual, the recommended safe dosage falls within the range of 2 to 4 milligrams of diphenhydramine per kilogram of the dog’s body weight or approximately 0.9 to 1.8 milligrams per pound. For example, a 20-pound dog would typically receive a dose ranging from 18 to 36 milligrams. It’s important to note that this information is accurate as of February 14, 2021, and consulting with a veterinarian for precise dosing tailored to your specific dog is advisable.