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Hello, I'm Dr. Deb and will do my best to help with this concern about your dog.
Can you tell me the milligram amount of Diphenhydramine that's listed on the package?
I'm happy to reassure you that your dog is going to be just fine.
Dihenhydramine is the active ingredient in Benadryl (at least here in the States) which is commonly suggested for many conditions which dogs might experience. The dose is typically about 1 mg per pound of body weight which would be 60 mg for a dog this size.
Therefore, if he only ate one tablet and it's 25 mg, then he's not likely to have any side effects. He might become a little sleepy even at this low of a dose but it should wear off in 12 hours or so.
He'll be fine. Deb
You're more than welcome.
I'm always glad to provide good news in situations such as this:) Deb