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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Gabapentin is very safe, and used frequently in dogs for pain.
The most you can expect with an overdose like this is some sedation and ataxia (incoordination). Those signs should resolve on their own over 12-24 hours.
I hope this helps, let me know if you have any other questions.