KT: although I'm not a nutritionist nor DVM, I can theoretically figure out why some foods would be harder to digest than others. Since by products (which includes organs, hearts, fur, hooves, etc) are harder to digest than muscle meat, if there are larger portions of these products in a food, it would take longer to digest than muscle meat and fat.
Poor quality manufacturerss will include more grains and fillers into their foods, and the price point will show it. The better a food manufacturer is, the better the ingredients and the higher the price.
MissOMally, the manufacturer's websites mention where the food is from, with Stella and Chewy's specifically saying organic, free range, and no hormones and no antibiotics. And AFS says the same thing: http://www.animalfood.com/
. As does ZiwiPeak. Wysong says their food items are organic, but doesn't explain. You'd have to call them.
Mine never liked the chicken or turkey pieces directly given to them, although they wouod probably take them now. However, they took to raw soupies easily. Take your kibble, and soak over night. Add some warm water the next day and serve. Once they take to that, add 1/4 of a Stella and Chewy's patty to the soaking kibble the night before. They shuld take to that easily. Then increase the amount of S&C in the soup, decreasing the amount of kibble. In about 2-3 weeks, they wil be eating raw soupies, and what a healthy, fully, 100% nutritional meal!