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Yes, this was an actual book.
Now I'm not going to ask "what if dogs really did cause cancer?" because that would obviously be ASB.
But what if Samuel Walter Cort's book became popular and was widely believed? (This has happened to enough crank theories that I don't think we can dismiss the possibility entirely. And after all, while there are many dog lovers, there are also dog haters, and some in the latter group might be attracted to any theory blaming dogs for anything.)