Donald Trump shocked audiences at this week’s presidential debate with the claim that foreign migrants were eating household pets in Springfield, Ohio, a small town currently reeling under the strain of an unprecedented number of new arrivals, mostly from Haiti. “They’re eating the dogs,” Trump said. “They’re eating the cats.” Reactions on both sides were spirited. Conservative social media accounts created memes that portrayed Trump, dressed in camouflage, and toting heavy weapons, as the savior of innocent pets. There was even a viral TikTok trend, which chopped up Trump’s speech and set it to dance music. “They’re eating the dogs,...