Generally, pet foods must adhere to the proper ratios of macro nutrients, i.e , proteins, fats and carbs. They should also be devoid of fillers that can be allergic to pets, or are not nutritious. Depending upon the animal/species and it's body weight, nutrition of t he macro and micronutrients per serving must be adequately labelled on the packaging. Despite all these, there are still chances of underdosing or rampant use of fillers in certain cheap brands. So, the next way to ascertain the quality of a brand would be to observe the pet for any signs of adverse health or allergic reaction, it's fur and coat quality, etc. Not to mention that the brand of food must be budget friendly too. If the pet owner thinks that the pet is doing well with a particular brand, then they should continue with the brand. Otherwise, they must consult a vet and opt for other options like home cooked food, provided the meals contain proper nutrition, or hypoallergenic foods..
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