Here are some stuff I gathered from a little bit of research. I only go grain-free so I didn't look up the other Earthborn formulas.
Earthborn has 4 grain-free flavors. Meadow Feast is a new flavor, so you might not have it in your store yet. I usually rotate flavors with my dogs. Blue Wilderness has the same protein/fat/carb content on all 3 flavors they offer so I can just switch flavors easily without changing feed amount. But for Earthborn, each flavor have different nutritional content so you'll need to check before switching flavors within the same formula because you might have to feed lesser or more as you rotate.
My philosophy:
I consider a dog food good food if it seems to contain a lot of quality meat (not byproducts or generic animal meals) as the protein source instead of plant matter. Meat proteins are more more readily biologically available to dogs than plant proteins.
Another measure is if it is low in carbs - the lower the better, with any carb content above 50% automatically a bad dog food.
I also like dog food with high animal fat content. Yes, it is not good for humans to have high animal fat, but it is good for dogs because it is their main source of essential fatty acids that is needed to sustain energy (yes, Bullys need energy too - so they can carry all that muscle they tend to have a lot of). I like fats within the 15-20% range if they seem to come from quality meat.
I also like to just read the ingredients list and avoid questionable ingredients. I don't like grains in dog food, especially corn, because dogs lack salivary amylase to process all that carbs before it hits the stomach so it tends to cause allergies to digestive sensitive dogs like Bullys. Corn is very hard to digest for dogs. Of course, you can't make a kibble without carbs - you need the starch to create the dough that makes the meat stick together into a kibble. Usually, though, grain-free kibble use vegetable carbs - usually potatoes or peas - and these carbs are less likely to cause allergies in most dogs.
I also like food with probiotics and chelated minerals. Probiotics help in boosting the immune and digestive systems. Chelated minerals are used to coat the proteins to help in making the proteins more absorbable. This is why it is easy for Fromm and Blue Wilderness to switch flavors within the brand and possibly easier to switch foods altogether to Fromm/BW because Fromm and BW has probiotics and chelated minerals.
All Earthborn Grain-Free flavors meet my guidelines of a good dog food. Good amount of quality meat, high fat, low carb, excellent ingredients with probiotics and chelated minerals. But... I'm trying to decide whether to switch from one good food - Blue Wilderness - to another good food - Earthborn. So... onwards with the comparison...
Meadow Feast (I consider this their limited ingredient grain-free version):
Lamb Meal, Peas, Tapioca, Canola Oil (preserved with mixed Tocopherols, a source of Vitamin E), Pea Protein, Pea Fiber, Flaxseed, Natural Flavors, Blueberry Fiber, Cranberry Fiber, Apples, Blueberries, Carrots, Spinach, Cranberries, Salt
* Canola Oil is a good source of Omega-3 but it is not as readily absorbable to dogs as fish-based oil.
Protein - 26%
Peas contain lots of protein, so with only peas and lamb being the main protein sources, there is lesser meat on this than Blue Wilderness.
Fat - 15%
Moisture - 10%
Fiber - 5%
Estimated Carbs - 41%
I use my own calc for carbs since this is not provided in the label - I calculated as 100% minus (Protein+Fat+Moisture+Ash). I estimate ash as 8% for high quality foods).
Feeding Guide - 41 to 60lbs (Bullys are ideally between 45 and 55 lbs) - 2 to 3 cups.
Great Plains Feast:
Bison Meal, Peas, Pea Protein, Tapioca, Dried Egg Product, Canola Oil (preserved with mixed Tocopherols, a source of Vitamin E), Flaxseed, Lamb Meal, Pea Fiber, Natural Flavors, Blueberry Fiber, Cranberry Fiber, Apples, Blueberries, Carrots, Spinach, Cranberries
Protein - 34%
You got Bison and Peas as the first 3 ingredients. Lamb Meal is quite far down the line. Still lesser meat than Blue Wilderness.
Fat - 18%
Moisture - 10%
Fiber - 4%
Estimated Carbs - 30%
Feeding Guide - 35 to 50lbs - 1 3/4 to 2 1/4 cups
- 50 to 60lbs - 2 1/4 to 2 3/4 cups
(note: This is high protein food, so feed less than Meadow Feast).
Coastal Catch:
Herring Meal, Potatoes, Peas, Canola Oil (preserved with mixed tocopherols, a source of Vitamin E), Pea Protein, Tapioca, Pea Fiber, Dried Egg Product, Sweet Potatoes, Salmon Meal, Whitefish Meal, Flaxseed, Natural Flavor, Blueberry Fiber, Cranberry Fiber, Apples, Blueberries, Carrots, Spinach, Cranberries
Protein - 32%
- Besides the first ingredient, the meats are still further down the line. Still doesn't match Blue Wilderness.
Fat - 18%
Moisture - 10%
Fiber - 4%
Estimated Carbs - 32%
Feeding Guide - 35 to 50lbs - 1 3/4 to 2 1/4 cups
- 50 to 60lbs - 2 1/4 to 2 3/4 cups
Primitive Natural:
Turkey Meal, Chicken Meal, Whitefish Meal, Potatoes, Chicken Fat (preserved with mixed tocopherols, a source of vitamin E), Dried Egg Product, Tomato Pomace, Apples, Blueberries, Carrots, Peas, Spinach, Garlic, Yucca Schidigera Extract, Taurine, Cottage Cheese
*Now we're talking! I love this one. Meat, Meat, Meat, Plant, Meat. THAT's what a dog food should look like! That's what I like about Blue Wilderness! And this is even BETTER than Blue Wilderness!
Protein - 38%
Fat - 20%
Moisture - 10%
Fiber - 2.5%
Estimated Carbs - 24%
Feeding Guide - 35 to 50lbs - 1 3/4 to 2 1/4 cups
- 50 to 60lbs - 2 1/4 to 2 3/4 cups
(This is really high protein food. I'd go with the lower end of that feeding guide when feeding Bullys).
So... conclusion. I don't think I'm going to switch. There is only 1 flavor here that I find is comparable to Blue Wilderness. And the Primitive Natural is priced higher than the other flavors so it's not much savings for me.
DISCLAIMER: My dogs are healthy dogs without special medical considerations. All my research is geared towards that. Special needs dogs - for example, dogs with kidney/liver problems should not be on high-protein food - and those with specific dog allergies will probably not benefit much from this research.
Hope this helps!