Posting from another thread as it is also relevant here:
When Marty arrives in 1931, Einstein paws at Edna and she says, "That mangy dog assaulted me once before" before going into the store, griping and whining about how something's a law and we should look it up. It can be inferred that when Doc was thrown in jail, Einstein then assaulted Edna, took the shoe, and went back to the DeLorean. That way, if Doc was fine, he was sitting there ready to go home. If he wasn't, he would arrive in 1986 to find Marty.
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"Geez, we've been back together for five minutes Doc, and you're already talking about the end of the universe."
"Stupid, stupid rat creatures!"
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