Dog losing weight

5 Reasons Why is Your Dog Losing Weight?

Why is Your Dog Losing Weight?

Dog losing weight

Dog losing weight is a serious but in most cases a decidable problem.


“Why is my dog not gaining weight?”, “My dog is losing weight”,

“My diabetic dog won’t eat”… If you have similar thoughts, this article will help you to deal with your problem.


There’s a whole list of circumstances and problems which can influence weight loss in animals. But don’t worry beforehand, there are many of them which are easy to get rid of.

So, here are 5 reasons for weight loss in dogs.


  1. Is a dog losing weight because of food Issues?  

Dog losing weight

Some dogs are quite choosey about food and drink. Any change can cause refusal of eating. That’s why you should pay attention to the dog’s food itself. Check all the components that you feed the dog. Maybe you have changed the dog food recently? Or a manufacturer has changed the food composition, adding some components that are not really pleasant for your dog? If you have moved, tap water may differ from tap water in the previous apartment, so when you moisten the dog’s food, it acquires a different taste.

One more essential factor is stress. Have you brought another animal home? There’s a possibility that it scares your dog while eating nearby. In this case, it is obvious that you need to place animals’ dishes in different parts of the room or even in rooms.

  1. Sudden weight loss diabetes caused by diabetes mellitus

Dog losing weight

Diabetes mellitus is a disease that may stimulate weight loss in dogs. There are a few other symptoms of diabetes mellitus that will help you to recognize the disease:

  • Excessive water consumption
  • Increased hunger
  • Frequent urination
  • Cataract formation

Here’s the mechanism of the disease. Dog’s diabetes mellitus has the same nature as the human’s one. The dog’s organism doesn’t have enough amount of insulin needed to break down blood sugar. As a consequence, the dog’s body starts to break down fats and proteins in order to provide itself with energy.

In case you suspect your dog has diabetes mellitus, contact a veterinarian and necessary tests will be conducted: blood glucose tests, urinalysis, and so on.


  1. Pain Issues

Dog losing weight


If you’re wondering “Why is my dog losing weight, though there are no conditions that have changed, and the dog doesn’t have any serious diseases?”. The reason can consist of strong pain of different types. For example, the dog’s teeth or mouth inside can be injured or have tumors. Thereby, it becomes painful for your dog to chew stiff dry food.


Another reason is that the food may include some components that call digestive problems such as bloating, gases, stomach pain, and so on. If you didn’t change the dog’s diet, then the manufacturer could have changed the food composition. In case you saved some old food packaging there are pictures of it on the Internet, you can compare them with the new ones.


Besides, it is necessary to check if your dog has a thing stuck in its throat and blocking the food to get into the stomach.


There are some symptoms indicating the presence of pain or blockage of the throat.

  • Abdominal pain
  • Drooling or panting
  • Yelping when the stomach is touched
  • Oddbreathing sounds
  • Vomiting
  • Nervousness or apathy

If you discovered any of these symptoms in your dog, take it to the veterinarian as soon as possible.

  1. Cancer

Dog losing weight

Unfortunately, cancer is one of the diseases which can reveal itself in the last stages

You can say “My dog is losing weight but eating, how is it possible?”. The fact is that cancer speeds up metabolism, so weight continues to drop off with the same amount of food. Moreover, while being ill a dog is losing muscle mass because of the feature of metabolism change: it makes protein decomposition more intensive.

There are some different reasons for weight loss during the period of illness. For example, a tumor places somewhere in the gastrointestinal tract and it becomes hard to eat for a dog.


By the way, for small dog breeds, like a chihuahua, it may be quite hard to define weight loss. You can weigh your dog and compare its weight to one it had in the past if you have it written.


There are some symptoms that can present in case of cancer:


  • Bad smells from dog
  • Coughing or shortness of breath
  • Not healing skin sores
  • New cysts or swollen spots
  • Limping and other mobility issues
  • Urination and defecation changes
  • Increaseddrool
  • Eating problems
  • Exhaustion

If you noticed some of the following indicators, check your dog for cancer. A doctor will carry out necessary tests and suggest alternative variants of treatment programs.


  1. Other Weight-Affecting Diseases and Issues

Dog losing weight


Of course, diabetes mellitus, cancer, stomachache are not all the diseases that can be the reasons why dogs won’t gain weight. Another frequent disease is kidney disease. Parasites take lots of powers of an animal which leads to the fact that dog’s losing weight but eating. Kidney disease can be recognized with the help of a blood test. An important detail is that having this disease a dog starts to lose weight at the end of the period of illness, so it is needed to hurry up even more to confirm kidney disease or to remove it from the list. If


Such problems as drug reaction, heart disease, liver disease, surgery consequences, and stress can call weight loss.


Take your dog to the veterinarian if the reason for weight loss and refusal of eating is not clear. Do not despair! There is a high probability that a doctor will define and treat the issue of your dog successfully.


Though it is natural to lose some weight for old dogs gradually, scientists advise taking your pet to a doctor if you notice that an old dog is losing 10% (as a minimum) of the weight and muscle mass in a year. Just like any other creatures, dogs are threatened by diseases more and more every year.


If it is not an emergency situation, it will be useful to observe your dog’s behavior and all the symptoms and to do an examination (to take a look at teeth, throat, and excrements, to palpate a tummy, and so on). Thanks to this data it will be easier to make a diagnosis for a veterinarian.


That was all about weight loss in dogs, we hope you will manage to define the reason for your dog’s weight loss.


author’s recommendations: How to Recognize Congestive Heart Failure in Dogs



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