A. This is a bit of a tough one to answer without a little more detail like is he acting normal, how's his energy level, is he going to bathroom normally, etc but based on the information provided it's probably best to book a vet appointment if he is not quite himself. The good sign is that he is drinking and staying hydrated, dogs can go a few days without eating but this is still not normal behaviour. It's possible he's just feeling a little under the weather but this could also be a sign of a much larger problem like a more serious illness. 72 hours is starting to get outside my comfort zone and I would seek professional medical advise. Hope he's back to his ha some self soon.
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