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My guess was going to be either horses or dogs. Thinking of the settlers of our country and the Native Americans before them, where would they have been without horses? Dogs, not only in professional capacities like K9s or bomb-sniffing canines but the stories you hear so often about, for example, a person who had a seizure or whatnot and their dog ran to alert someone and bring back help.
I love my cats, but I don't think they'd lift a claw to go and get aid. 
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