As dogs grow older, it’s natural for their habits to shift. But if your old dog is eating and sleeping a lot more than usual, you may wonder if it’s part of aging—or if something more concerning is going on.
Increased appetite and prolonged sleep could be normal, but they may also signal health changes that deserve closer attention.
We outline the common reasons why your senior dog is eating and sleeping a lot, what to watch for, what to do at home, and when to consult your vet.
Old Dog Eating and Sleeping a Lot: Why It Happens
An old dog eating and sleeping a lot could be experiencing age-related slowdown, boredom, metabolic changes, hormonal imbalances like Cushing’s disease, medication side effects, or early signs of a medical issue such as hypothyroidism.
While some dogs simply slow down in their golden years, changes in sleep and appetite should still be monitored closely.
Old Dog Eating and Sleeping a Lot: Common Causes
1. Normal Aging and Energy Conservation
As dogs age, their energy levels naturally decline. Just like senior humans, older dogs may prefer long naps and slower walks.
Their increased sleep may be nothing more than a reflection of physical fatigue or cognitive slowing.
Similarly, a stable or slightly increased appetite can be expected in some seniors, especially if they’re not as active as they used to be.
2. Boredom and Reduced Mental Stimulation
Older dogs who no longer play as much or go for long walks may sleep out of boredom.
If their food intake hasn’t decreased along with their activity level, they may gain weight or eat more out of habit.
Dogs left alone for long hours or stuck in the same environment without stimulation may fill their day with sleeping and snacking.
Related: Dog vomiting and not eating (Causes and when to worry)
3. Hypothyroidism
This hormonal condition is common in middle-aged and senior dogs and leads to a slower metabolism.
Signs include weight gain, excessive sleep, low energy, hair thinning, and sometimes increased hunger.
Hypothyroidism is treatable with daily medication, but it must be diagnosed through bloodwork.
4. Cushing’s Disease
In older dogs, Cushing’s disease (hyperadrenocorticism) can cause increased appetite, excessive thirst, frequent urination, and lethargy.
If your dog seems ravenous but is gaining weight and acting sleepy, this hormonal disorder may be to blame.
It’s most common in dogs over 6 years old and typically progresses gradually.
5. Medication Side Effects
Many senior dogs take daily medications for arthritis, heart disease, or other chronic issues.
Some medications can increase hunger (like steroids) or cause drowsiness.
If your dog recently started a new medication and you’ve noticed increased eating and sleeping, talk to your vet about potential side effects or dose adjustments.
6. Cognitive Dysfunction Syndrome (Canine Dementia)
Cognitive decline can cause dogs to eat oddly or sleep more than normal—sometimes even during the day and night in reversed patterns.
A dog with early dementia may forget they’ve already eaten or seem confused and lethargic.
You might also notice staring, wandering, or barking at nothing.
What to Do If Your Old Dog Is Eating and Sleeping a Lot
If your dog seems otherwise healthy, here are steps you can take to support their needs and evaluate whether the behavior is harmless or not:
Track their behavior: Log sleep hours, appetite changes, and energy levels over a week.
Adjust feeding portions: If your dog is eating more but moving less, they may need fewer calories.
Offer mental stimulation: Try puzzle toys, gentle games, or short walks to reduce boredom.
Stick to a schedule: Older dogs benefit from predictable routines for meals, potty breaks, and rest.
Check their environment: Make sure your dog isn’t overheating, overstimulated, or under-exercised.
If the pattern continues or becomes extreme, it’s time to involve your vet.
When to Call or Visit Your Vet
Reach out to your veterinarian if:
Your dog’s appetite has increased drastically or they seem insatiable.
Weight gain or weight loss accompanies the sleep and eating changes.
Your dog is sleeping excessively (more than 18–20 hours daily).
Other symptoms like panting, pot-belly appearance, hair loss, or frequent urination appear.
You suspect medication may be affecting their energy or behavior.
Your vet may run blood tests to check for endocrine disorders like hypothyroidism or Cushing’s.
Imaging or urine tests might also help rule out other underlying diseases.
Many senior dogs benefit from regular wellness exams every 6–12 months to catch subtle issues early.
Key Takeaway
If your old dog is eating and sleeping a lot, it might be completely normal—or it could be a signal that their health is shifting.
While some extra napping and a hearty appetite aren’t always cause for concern, significant changes in behavior or energy levels should be discussed with your veterinarian.
Senior dogs thrive on routine, comfort, and attentive care.
Monitoring their habits closely ensures you catch early signs of health issues and support them through the aging process with compassion and confidence.