As a dog ages, its behavior inevitably changes. The amount of time that a dog spends sleeping is one of these changes.
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Considerations
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Just like humans, dogs progress from a state of infancy into maturity and then regress into a state that is infancy-like in some ways. Compared to humans, however, their lifespan is relatively short. Keep this in mind as your dog ages and begins to show less spark than usual.
Fun Fact
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Dogs are descendants of wolves, which rely on hunting for survival. A successful hunt is as much a matter of conserving energy as expending it. Dogs have inherited this pattern, whether the "hunt" is manifest as play, work such as shepherding or guarding, or actual hunting.
Warning
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While it isn't unusual for an older dog to sleep more than it did in its youth, abrupt changes in longtime habits are always a red flag and should receive thorough attention, and (if necessary) medical treatment.
Different Needs
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An older dog needs less food than a younger dog, and will sleep oftener the oftener it eats. An older dog requires less exercise than a younger dog. An older dog is likelier to tire out in hot weather. Dog owners should be sensitive to these facts.
As Your Dog Ages
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Arthritis, bone decay, eye and ear troubles, mood swings and digestive difficulties are among the ailments which might affect an older dog's sleep. When in doubt, contact your veterinarian promptly.
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