Aside from the sickness problem, and thinking about the not eating part... we have had this recently with two of our springers, (they are fed dry mix and 1/2 tin of chappie, once a day) and when they've been off their food, we normally mix up some gravy and put that on it. They usually are quite eager to eat it with some bisto! We then keep this up for up to a week and at some point they usually turn there nose up to it with gravy on and decide they want it dry again, and then are back to normal.
The fun part is that they will always keep you guessing!
