Dog treats are a reasonable way to start, but if they don't work with a particular dog, you need to escalate. I'm surprised no one has suggested calling the local dog warden.
If you must take things in your own hands, the pepper spray is a good start. Also, dogs have a fairly thin skull on the top of their heads. If you think one will actually come close enought to attack you, carry a heavy rock or metal plate as you run by and bash it square on top of the head. You have a decent shot at splitting its skull and solving your problem.
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