@aimee, there is no such thing as “nonessential fats.” Using the term in this fashion is scientifically incorrect. The fact is any level of carbohydrates in a canine diet is what is nonessential. Dogs do not require ANY carbohydrates in their diets to thrive. And the calories are better derived from essential fat and protein sources.
Optimal calories from fat are about 50-60% of calories (remembering fat has 2.25 times as many calories per gram as either protein or carbohydrates.
Replacing too many calories from protein with carbs leads to muscle tears and inadequate protein to build and repair muscle tissues and carbohydrate calories replacing fat reduces aerobic capacity and endurance, while promoting weight gain and tooth decay.
The reason pet food companies have so-called “weight loss” formulas built around high carb foods (besides the low-quality and low-cost carbs being a way to maximize profits) is that too many people don’t cut back on the amount of food when they feed higher-quality high-protein/high-fat alternatives. But stuffing a dog with a high carb diet is the path to obesity, It doesn’t work.
It is much better to serve smaller portions of high-calorie food. The fat in high-protein/high-fat meals satisfies a dogs hunger (and provides sustainable energy) where a dog fed high carb meals is always hungry and lacks the energy stores for sustained activity.
Trying to get a dog to lose weight on high carb rations is a recipe for failure. It doesn’t work.
Best to get rid of the nonessential calories from carbohydrates that are unnecessary in a canine diet. Just look at the body type of any PMR-style raw fed dog to see the drastic difference eating no carbohydrates makes in promoting a lean muscular body type.
The best thing one can do for a dog for a dog with disk or hip issues is to get it lean and strong. A high-protein/high-fat diet is the key to that end. High-carb diets cut vitality, crowd our essential nutrients, and lead to obesity and health issues.
Bill
