Shouldnt it be what food?
At the time that I am doing this, 1/22/19, it now accepts what food.
어느 is which.
In english we would usually use "what".
무슨 ... What
어느 ... Which
If there are multiple food options we would ask which one he/she eats in case they have a specific diet for example.
Could I write instead : "Which type of food does this dog eat?"
Or is it still wrong?