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- Lethargy in Dogs

- Depression
- Old age
- Medical conditions
- Anemia is a decrease in red blood cells and iron in the blood
- Distemper is a serious virus that causes a high fever, respiratory distress, nasal discharge, anorexia, gastrointestinal distress, and neurological disorders (paralysis and seizures)
- Parvovirus is a serious and often fatal condition that causes extreme vomiting, diarrhea, and anorexia
- Diabetes is a sugar regulating disease that causes increased urination, excessive thirst, sleepiness, and depression
- Hypothyroidism is caused by thyroid hormone deficiency
- Dehydration is a dangerous lack of water and electrolytes such as potassium, chloride, and sodium
- Heart disease such as cardiomyopathy, congestive heart failure, and heartworms can all cause lethargy
- Liver disorders such as hepatitis, bile duct obstruction, or liver disease cause lethargy as well as jaundice, appetite loss, diarrhea, and vomiting
- Kidney disease can make your dog lethargic and he may also be urinating more than usual and have fluid retention
- Nutritional deficiencies cause lethargy and may be caused by an underlying illness
- Respiratory distress from infection or any other cause will make your dog lethargic
- Cancer of any kind can affect your dog’s energy levels and cause many other various symptoms depending on where the cancer originates
- Osteoarthritis is a painful condition that creates lethargy and depression as well as swollen joints
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