(Britain, Australia, New Zealand, Canada, idiomatic) An unappealing mixture; a disorderly situation; a mess.
Example: 1961 July 7, "Black Temper," Time:
So complex was the scheme that neither blacks nor whites could say for certain who had won. "A dogâ€²s breakfast," cried Laborite M.P. James Callaghan. "I say frankly that I do not begin to understand it."
2008 May 18, David Usborne, "The Gene Genie gets an LA makeover," The Independent (UK) (retrieved 9 June 2008):
Critics here are reserving judgement on whether ABC will do "Life in Mars" justice or make a dogâ€²s breakfast of it.
2010, Kate Jennings, BouleversÃ©, Trouble: Evolution of a Radical/Selected Writings 1970-2010, page 277 (Google preview):
Iâ€²d trade one of their sublime sentences for the entire crop of sprawling, show-offy novels â€“ dogâ€²s breakfasts of facetiousness â€“ that are currently the literary vogue.