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If your cat loses an excess of ten percent of its normal body weight (when it is not due to fluid loss), you should be concerned. There are many things that can cause weight loss, including anorexia, the cat's quality of food, and/or chronic disease.
It is important to understand a severe case of weight loss will affect many of the cat's body system, but often it will depend on the cause and severity of the underlying medical condition.
Weight loss and cachexia can affect both dogs and cats. If you would like to learn more about how this condition affects dogs please visit this page in the PetMD pet health library.
There are many factors which can lead to weight loss in a cat, including:
Other causes include various diseases and types of infections such as:
Your veterinarian will begin with a variety of diagnostic tests to find the underlying cause for the weight loss. After an initial health assessment, your veterinarian may use one or more of the following tests on your cat:
An increase in the number of bad white blood cells
A gland that aids in both digestive and insulin functions
The digestive tract containing the stomach and intestine
The tube that extends from the mouth to the stomach
The process of removing tissue to examine it, usually for medical reasons.
A condition of the blood in which normal red blood cell counts or hemoglobin are lacking.