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Hello. Thanks for the question.
Methadone is a very safe medication in dogs, as are many opiates. They don't have the respiratory depression that we see in dogs. In a dog this size, you could go up to 70 mg at a time as a normal dose. The dose range goes up to 0.5 mg per lb body weight.
You may see some sedation and potentially some GI upset. That is all I would expect with this ingestion. You don't need to do anything, other than let him metabolize it on his own.
I hope this helps, let me know if you have any other questions.
Luckily, this is a very safe medication. No worries!