I thought I could compare pet foods by comparing labels. Based on the “Guaranteed Analysis” and ingredient list, it appears to me that diets available through veterinary hospitals are essentially the same as pet food sold elsewhere.
You are absolutely right! It appears to be so! The “guaranteed analysis” is a quantitative analysis performed in a laboratory, however, it tells us nothing about ingredient quality. Shoe leather, hair feathers, beaks and chicken feet would be high in crude protein, but provide poor nutrient value for your pet. There are many different quality classifications (grades) of ingredients. An excellent example is poultry meal, a common ingredient. The cost of top grade (chicken meal) is significantly higher than the cost of regular poultry meal, and the digestibility and nutrients provided to your pet are significantly better. You cannot determine the quality of an ingredient based solely on label information.
