which is toxic to dogs. The normal dose of Benadryl varies somewhat depending on what it is being used for: The normal dose for allergies is 1–2 mg per pound of body weight up to every 8 hours ...

Dogs also metabolize Benadryl differently, so it’s not a good idea to rely on human dosing guidelines ... for dogs depends on their weight. A small dog will need much less than a big dog ...

There are many brands and forms of diphenhydramine available. Read the dosing instructions carefully for each product because the amount of diphenhydramine may be different between products.