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Hello. Thanks for the question.
Acepromazine will cause pretty profound sedation at this dose. It can also drop the blood pressure. I would try to make sure he is drinking plenty of fluids. Keep a close eye on his gum color. If it starts looking grey or pale, then I would get him to a vet.
We don't really have a lot to reverse Ace, but we can put them on IV fluids and meds to increase the blood pressure. That is usually the most that we need for these dogs that get an overdose. My guess is that he'll just sleep it off at home over the next 12-24 hours and not need any more aggressive care.
I hope this helps, let me know if you have any other questions.