Mars Petcare (Australia) have voluntary recalled Advanced Dermocare dry dog food.
https://www.advancepet.com.au/
http://www.dailymail.co.uk/news/article-5539069/Dog-food-range-pulled-shelves-one-police-dog-dies-two-down.html
http://www.poisonedpets.com/mars-dog-food-recalled-after-police-dogs-in-australia-die/
A follow up article relating to Mars Petcare (Australia) voluntary recalling Advanced Dermocare dry dog food.
http://www.abc.net.au/news/2018-06-06/number-of-megaesophagus-cases-soar-advance-dermocare/9839982
Study confirms rise in megaesophagus cases in dogs was linked to pet food | The Melbourne Newsroom
http://newsroom.melbourne.edu/news/study-confirms-rise-megaesophagus-cases-dogs-was-linked-pet-food
Summary of the University of Melbourne investigation into Megaoesophagus and its association with pet food.
https://www.u-vet.com.au/news/megaesophagus-and-pet-food/megaoesophagus-and-pet-food-report14122018