A majority of the working dog's energy is derived from __________ metabolism.

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BlackTom AI · Accepted Answer

The question asks about the primary energy source for a working dog's energy needs.

Since no answer options were provided, I will ground the reasoning in general physiology and canine metabolism.

- Fat as a major fuel source: For sustained, endurance-type activity, fats provide a large and efficiently metabolized energy reserve. In many working dogs, especially during long-duration tasks, the body shifts toward increased fat oxidation (beta-oxidation) to spare limited glycogen stores and sustain energy over time. This makes fat a predominant energy substrate in prolonged work.

- Role of carbohydrates: Carbohydrates (glycogen) are important for high-intensity, short-duration efforts that rely on anaerobic glycolysis. In longer, steady work, carbohydrate oxidation contributes less proportionally as fat utilization rises, which helps delay fatigue by preserving glycogen.

- Protein’s contribution: Protein generally contributes minimally to energy production under normal conditions, serving more for tissue maintenance and repair. It only becomes a notable energy source under extreme energy deficits or prolonged fasting, not during typical working intensity.

- Why this choice makes sense for working dogs: Working dogs are bred and trained for endurance and stamina. Their metabolic systems are well-adapted to efficiently mobilize and oxidize fat during extended exertion, providing a dense energy source (9 kcal per gram) and reducing the need to rapidly deplete glycogen stores.

If an option list had included fat vs carbohydrates vs protein, choosing fat would align with the physiological pattern of prolonged, aerobic energy production in canine athletes. Without alternative options to compare, this explanation highlights why fat is commonly the primary metabolic fuel during sustained work in dogs and how it contrasts with other energy sources.

A majority of the working dog's energy is derived from __________ metabolism.

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