Non-toxic dog whistles?
The OED's definition of the political sense of dog whistle is "A statement or expression which in addition to its ostensible meaning has a further interpretation or connotation intended to be understood only by a specific target audience", derived from the literal sense "A high-pitched whistle used in training dogs; (later) esp. one producing sounds at a frequency above the range of human hearing". The definitions at Merriam-Webster and Wiktionary are similar.
There seem to me to be a few things wrong these definitions, at least as the term dog whistle is generally used. One thing missing that the "further interpretation" is (viewed by user of the term dog whistle as) shameful. And one superfluous part of the definitions is the idea that the "further interpretation" is not understood outside the "target audience" — rather, the goal (as attributed to the dog whistler) seems to be more a matter of euphemism or deniability.
Scanning instances of dog whistle on Google News this morning, the first dozen or so of the examples seem to me to confirm my impressions.
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