There’s actually no official definition for this claim when it comes to dog food, meaning that any dog food company can stick it on their products. Dog food brands with this label will likely require a little deeper research to see if the food is made up of only ingredients from plants, meats and mined sources.
Again, according to Dr. Sturtz, “adding vitamins to a food would not be consistent with the term ‘natural’. Therefore, to say that ‘natural’ food is better for the animal is to misinterpret the term.”
Honestly there is a lot of debate about whether or not a low fat diet is good even for humans. Dogs don’t actually need to worry about fat consumption so much. They can consume both saturated and unsaturated fats just fine and not suffer any major side effects.
Unless your dog suffers from obesity or pancreatitis, there’s really no reason to worry about tracking down low fat dog food. If you have concerns about your dogs weight and health, be sure to consult a veterinary professional.