Hello,
I have my 8 month old English Mastiff on Orijen Large Breed Pup for the past 5 months now. However, I mix it with Lifes Abundance dry kibble as the grain free rich Orijen by itself makes his stool too loose. I have my Samoyed on Orijen 100% and and he does great , no loose stools. After reading the Orijen White Paper and learning about how they make the food it is clear that Orijen makes the best dog food in the world. Of course it is " crazy" expensive but these Mastiffs are worth it !!! My Mastiff is doing great, he looks awesome and is about 142 pounds now. Just remember to mix in the Orijen very slow when first trying and literally take 2 months to get to a 50/50 ratio with your current food or Life Abundance ( also an amazing food that I highly reccomend ! )