With your mention of the neighbor I am wondering if he not only had a loud bark but barked a lot or whenever he was outside. If this is the case chances are likely he is hoarse as a result of all the barking. Just like if we go to a concert and scream non stop. If so, his voice should return once he rests his throat. You may want to keep him inside more so that he can do so.
With a poisoning you would notice other symptoms. Lethargy, vomiting, diarrhea, weakness. If these do not exist you are probably okay.
good luck
bloo
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