Labels on dog, or any pet food, for that matter, are not as informative as we apparently thing. Oh, it gives the level of fats, "not less than", and protein, (an old leather boot would be a good source of protein, if it were even a little bit digestible) CHO, or carbohydrates... everything not a fat or protein. Of more value than the 'guaranteed analysis' may be the 'ingredients' section where, listed in the order of decreasing amounts, it lists what is in the food. This still doesn't indicate whether this food would be any different than one with the same ingredients, or guaranteed analysis.
The real test for a food, but very difficult to fully run, is the feed trial. The results of a steady diet of a food is "proof of the pudding", so to speak. This doesn't mean 2 bags full, it means a lifetime of eating it, to demonstrate growth, performance in work, reproduction, and all other areas a dog is expected to perform in, such as shows, or field trials, or just lying around the house. But, not many companies will give us that sort of information, and if they did, which of the skeptics among us would believe them? Example, Purina Feeds used to make it a point of mentioning their kennels, which were nationally recognized as having top notch hunting dogs (Eng Setters, I think, probably others too.) But nowadays, all the previously premium feed manufacturers are supposed to be putting out garbage, if it isn't 'all natural', whatever that means.
Well, to wind up this tirade, as long as your dog is thrifty, and is growing and developing as you like, stay with your current food. Hopping from food to food will not give you any idea of what is good, or not.
One last thing, those analysis lists can be maintained by changing various ingredients... depending which is more economical on the raw material markets. Those subtle changes in ingredients to maintain the bottom line, may not look like much, but put yourself in your pet's shoes... what has it changed the taste? Those changes are possibly at the root of why Bowser doesn't like his food any more. Years ago, before Science Diet began becoming available everywhere besides the Vet's, they used to pride themselves on maintaining the same ingredient recipe, regardless of changing market prices. That was when Science Diet got it's reputation, which I think it is coasting on presently. Prescription Diets is a different matter, and not in the same discussion as this. But that is just one person's opinion.
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