Poor kitty. Is he eating atleast 1 cup of food a day? Depending on the quality of food you give to your cat, the amounts are different. For instance, if you feed him a very expensive food, they only need 3/4-1 cup of food a day. If your feeding him the cheaper stuff he needs twice as much. How old is your cat and has he always been skinny? Summertime makes cats shed and appear to be thinner. My cats lost some weight during the summer because they didn't eat as much with the crazy heat wave that was going on! Here's some information I found about Weight loss in cats.Weight Loss In Cats
Weight loss is a physical condition that results from a negative caloric balance, as in when metabolic utilization and excretion of essential nutrients exceed the caloric supply. Simply, more calories are being burned off than are being taken in. Weight loss is considered clinically important when it exceeds 10 percent of the normal body weight and is not associated with fluid loss.
During weight loss, the appetite may be normal, increased or decreased.What to Watch For:
Coprophagia (eating oneâ€™s own stool).Causes
There are many reasons for loss of weight. Some of these include:
Excessive nutrient loss.
Excessive use of calories.Diagnosis
Confirmation of weight loss is necessary. A thorough knowledge of history and clinical signs in addition to appropriate diagnostic tests are indicated when diagnosing an underlying cause of weight loss. Initial diagnostics include:
Complete blood count (CBC).
Thoracic (chest) and abdominal radiographs (x-rays).
Radioimmunoassay of serum trypsin-like immunoreactivity (TLI).Treatment
There are several things your veterinarian might recommend for symptomatic treatment prior to instituting a full diagnostic work up. Treatment is most often administered on an outpatient basis.
If an underlying cause has been identified, treat or remove it if possible.
Sufficient caloric nutrition in the form of adequate amounts of an appropriate, high-quality diet.
Supplementation with vitamins and minerals for severely malnourished patients.
Parenteral (intravenous) nutrition for patients who cannot take food orally.
Comfortable and stress-free environment, especially when eating.
An appropriate exercise regimeHome Care
Administer prescribed diet and medication. Periodically, your pet's weight should be recorded. Contact your veterinarian if there is recurrence or change in condition.This Information is from:Pet Place- Anorexia