AvoDermNatural Revolving Menu Dry & Wet Dog Food For Rotational Feeding, Food Intolerance and Sensitivities

Is this the duck or the trout formula? The title states "duck" yet the image and the description of the product say "trout"?

If i wanted to get a different flavor of this would i need to intoduce slowly into their diet?

Why is the trout and pea half off everywhere?

How many cups in a bag?