Why Is My Dog Not Gaining Weight?

It sometimes happens that despite the dog appearing in good health, with a good appetite, and eating without problems, that It’s unable to gain weight. Let’s see together the possible causes and how to deal with the situation.

Dog owners who are attentive to the quality of life of their dog immediately notice if there are weight variations and obviously will worry if they notice that their dog is undergoing weight loss or if they perhaps want to make their dog gain weight and cannot.

Worrying, in this case, is right, but let’s see together what could cause a problem of this kind.


When the food given is not suitable for that dog or is of poor quality and low in nutrients, this will easily lead to the dog losing weight despite eating the correct amount of food. Dogs, as well as humans, need a wide range of nutrients to stay fit and healthy.


It’s possible that you are not giving your four-legged friend the right amount of food It needs throughout the day and as a result, It will not get the adequate amount of nutrients It needs.


The presence of intestinal parasites often leads to weight loss, sometimes parasite infestations are also accompanied by vomiting, diarrhea, swollen abdomen.

Teeth problems

Sometimes these conditions are not taken into consideration, but they must still be given due importance as poor health of the dog’s mouth can cause the dog pain and discomfort up to leading It to eat much less than It should.

Diseases affecting the gastrointestinal system

Alterations in the liver, pancreas, stomach, and/or intestine, both inflammatory and infectious or cancerous, lead the dog to have a decreased appetite and consequent weight loss.

Hormonal disorders

Diseases such as diabetes or Addison’s syndrome or changes in the thyroid are all conditions that lead to alterations in the production of certain hormones that will lead to weight loss with a preserved or even increased appetite.

Very active dogs

Dogs that work, practice agility, or otherwise have a very active lifestyle will need a much higher daily caloric intake than dogs of the same weight who, however, follow a purely sedentary lifestyle.

As you have seen there are many possible causes that might cause weight loss in dogs. It’s always good to consult your veterinarian for a thorough examination and even blood tests when you notice that this is happening to your dog.

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