Wow Thanks for all the advice, I think I will stick with just one protein source. I heard somewhere along the way during my research that variety was better, but I rather have my house smell good. I decided to do grain free because of the research I did on dog diets. It doesn't make sense to me to feed a carnivore a bunch of seeds (aka grains). I like the TOTW because it is protein, fruits, and veggies. I will try and stick with the lamb or salmon and see how he fairs, Thanks guys and gals
My guy was originally on Orijen 6 fish; high protein and grain-free with lots of "good for you"s like fruit and probiotics. He did well for about 6-9 months then they changed the formula to add more "good for you"s and his digestive system rebelled. Long before I noticed the brittle coat and dry skin, Ranger was having room-clearing gas. As in, you couldn't breathe for about 10 minutes if you were caught in the room when he let one slip. Turns out all those fuits, probiotics and "good for you"s were NOT good for him. Probiotics helped a lot but it didn't make sense to me to be feeding a food that obviously wasn't agreeing with him so we switched to another high protein, grain-free food that had a less complicated ingredient list.
That being said, Ranger is a dog who needs to be on grain-free. He doesn't do well with oats or rice in his food. He can handle small doses in cookies but when fed kibble with those two ingredients in it, he gets ear and eye infections, gets itchy, and the last time he was fed it, he started vomiting undigested pieces of kibble from a meal he'd eaten close to 7 hours earlier. It doesn't matter if it's a grocery store so-called "bad" brand like Iams or a 'better' brand like Acana; he's still going to do poorly on kibble if those 2 ingredients are in it. Other dogs do just fine on kibble with grains and lots actually do better: poops firmer, no gas, lots of energy, etc.
I guess what I'm trying to say is that sometimes all the "good for you" things in the bags of pricey dog food is actually not that beneficial for the dogs. Sometimes the things people judge "bad" aren't that bad for a dog's health. While I still wouldn't feed a dog a kibble high in corn (that's MY preference, I don't feed my horse feed high in corn either), some grains are just fine.
I was just at the vets the other day and she was telling us that it is very important that we don't switch up the food at all. She said the only transition we should be making is from puppy food to adult food at 6 months and even then stick to the same brand. She said that it is not good for them to keep switching and may give them stomach problems. She also said not to worry about the dog getting bored of the food because they don't.
Not to purposely play devil's advocate here, but my brother took his dog to the vet last week due to hair loss and a rash on his back legs. The vet told him sometimes dogs can develop an intolerance to the kibble if they've been eating it for years. Granted, some dogs may be more sensitive than others but I think with anything it's good not to go too far either way. I agree it's not good to switch foods on a monthly basis but I don't think it's a big deal to change between different varieties within the same brand or even change food brands once or twice a year. Lots of people give a higher calorie food in the summer and a less caloric food in the winter. As with all things, moderation is key.