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Hello. Thanks for the question.
Doryx is a delayed release Doxycycline- an antibiotic. This is used commonly in dogs. When an overdose is taken, the main side effect we see is nausea and vomiting. I would just try to get some food into him, as that helps prevent nausea associated with Doxycycline. That is all I would do with him. The nausea, if present, should resolve on it's own over 24 hours.
I hope this helps, let me know if you have any other questions.