Hydrocodone can cause sedation, constipation, vomiting, lethargy, barking. Some dogs are hyperactive instead of lethargic.
Clonazepam can cause sedation or hyperactivity, loss of balance, barking.
With your dog's symptoms it could be either or both Hydrocodone and Clonazepam.
Clonazepam, in the oral dispersible tablet contains xylitol which can be very toxic to dogs.
If you haven't already, I would recommend going to an emergency clinic where Henry can be assessed and treated appropriately.
Be sure to take the bottles of medication.
If Henry didn't swallow too much of the medications he will probably be alright. But Xytitol can be a problem.
If you have any questions please email me - even after the rating - so that I can help you.