According to the American Heartworm Society, coughing, difficult breathing, fatigue, vomiting and loss of appetite are common symptoms of heartworms in cats. Cats can die suddenly after being infected with heartworms eve... More » Pets & Animals Pets Cats

Symptoms of heartworm in pets include coughing and unusual intolerance to exercise. In severe cases, a pet may show symptoms of anemia and fainting spells, notes PetMD. More » Pets & Animals Pets Veterinary Health

Some common diseases of pet cats are Feline Immunodeficiency Virus, Feline Infectious Peritonitis, Feline Gingivitis, Feline Chronic Renal Disease and Feline Heartworm Disease. Other common ailments and conditions that a... More » Pets & Animals Pets Veterinary Health

Symptoms of heartworms in dogs include a decrease in appetite, weight loss, fatigue after moderate activity, a reluctance to exercise and a mild, persistent cough, according to the American Heartworm Society. As heartwor... More »

Symptoms of tuberculosis include a loss of appetite, unplanned weight loss, coughing for three or more weeks or chest pain when coughing or breathing, according to Mayo Clinic. Some people with tuberculosis may experienc... More » Health Pain & Symptoms

Some symptoms of a weak heart include difficulty in breathing, general body weakness, irregular heartbeat, nausea, loss of appetite, impaired thinking and swelling in certain body parts. A weak heart normally leads to he... More » Health Conditions & Diseases Cardiac Health

Vitamin D toxicity may cause loss of appetite, fatigue, vomiting, dehydration, constipation, muscle weakness and irritability. An excessive amount of this vitamin causes high calcium levels in the blood, and over time, t... More » Health Medications & Vitamins Side Effects