My friend asked me to watch his dog three days ago I agreed for a few hours now I have been stuck with his dog for three days I don't want the dog what should I do ?

Give your friend a reasonable amount of time (24 hours?) to come get their dog. If they don't show, take the dog to the humane society. They will call the owner and hold for a few days. If they still don't claim, they rehome the dog.

If you haven't heard from your friend at all, I would check with other friends and family before making a decision. And maybe check hospitals and jail rosters before making a decision I might later regret.

I would talk to the friend