[anonymous]

@ 2doodlemom

Another informative article. Hope this helps https://www.petmd.com/dog/conditions/digestive/c_multi_Weight_Loss_and_Cachexia?page=show (excerpt below)

When should your dog’s weight loss concern you? The standard is when the loss exceeds ten percent of normal body weight (and when it is not due to fluid loss). There are many things that can cause weight loss, including chronic disease. It is important to understand this because the dog’s entire body will probably be affected by the weight loss, and it ultimately depends on the cause and severity of the underlying medical condition.

Causes

Insufficient calorie intake
Poor quality of food
Taste (palatability) of food
Spoiled food/deterioration from prolonged storage
Reduced appetite (anorexia)
Inflammatory bowel disease
Chronic protein-losing intestinal disorder
Intestinal worms (parasites)
Chronic infections of the bowel
Tumors of the intestine
Blockages in stomach/gut (gastrointestinal obstructions)
Surgical removal (resection) of segments of bowel
Disease of the pancreas
Liver or gall bladder disease
Organ failure (heart, liver, kidney)
Addison’s disease
Diabetes
Hyperthyroidism
Chronic blood loss (hemorrhaging)
Skin lesions that ooze and cause loss of protein
Disorders of the central nervous system that interfere with eating or appetite
Paralysis of the esophagus
Neurologic disorders that make it difficult to pick up or swallow food
Increased physical activity
Prolonged exposure to cold
Pregnancy or nursing
Fever or inflammation
Cancer
Bacterial infections
Viral infections
Fungal infections

Diagnosis

Your veterinarian will begin with a variety of diagnostic tests to find the underlying cause for the weight loss. After an initial health assessment, the following are some tests that might be recommended for your pet:

Fecal studies to look for chronic intestinal parasites
Complete blood count (CBC) to look for infection, inflammation, leukemia, anemia, and other blood disorders
A biochemical profile that will evaluate kidney, liver, and pancreas function, and the status of blood proteins, blood sugar, and electrolytes
Urinalysis to determine kidney function, to look for infections/protein loss from the kidneys, and to determine hydration status
Chest and abdominal x-rays to observe heart, lungs, and abdominal organs
Tests to evaluate the condition of the pancreas
Ultrasound of the abdomen
Bile acids test to evaluate liver function
Hormone assays to look for endocrine disorders
Using a scope to view the intestines (endoscopy) and biopsy
Exploratory surgery (laparotomy)

Treatment

At times your veterinarian may recommend treating your pet’s symptoms, especially if they are severe. This is not a substitute, however, for treating the underlying cause of the weight loss.

Once the appropriate treatment has been assigned, make sure a high-quality diet for your pet is provided. It may be necessary to force-feed, with nutrients given intravenously as necessary. The diet must be supplemented with vitamins and minerals. Appetite stimulants are also used occasionally to get the animal to start eating again.

Living and Management

A proper medical follow-up is vital, especially if the animal does not show improvement quickly. Monitoring during this period is also critical. The underlying cause of the weight loss will determine the appropriate course for home care. This includes frequent weigh-ins for the animal. Follow your veterinarian’s recommendations for treatment. And if your pet does not respond to the treatment, contact your vet right away.