Why does my cat lose weight?

All of us who live with a cat we love very much would like it to always be in good health. Unfortunately, while we can do some things to strengthen your immune system, we can never protect you from absolutely everything. For this reason, when you lose weight we have to worry and find out why this happens .

As there are several causes, I am going to explain why my cat loses weight and, in addition, I will tell you everything you must do to make it recover as soon as possible.

Why you lose weight

It can be for various reasons, the most common being the following:

Emotional causes


The cat is very sensitive. They do not usually like changes at all . The move, the arrival of a new member to the home, re-distribution of the furniture,… anything can make you feel so bad that you could even stop eating, with the consequent loss of weight.

For this furry, what you can do is use Feliway in a diffuser, which is a product made with the synthetic pheromones of the cat in charge of relaxing it. But it will not be the only thing you can do: you must also continue with your daily life , as if nothing was happening. Pay close attention to it and give it a lot of love . You can stimulate his appetite with cans of wet cat food, which are much tastier and more smelly than dry food.

New home

If you just adopted it and it does not eat, during the first day it is normal. Everything is so new to him that he needs time to get used to it. To help him, it is convenient not to overwhelm him or force him to do anything , just leave his feeder and drinker full and invite him to play several times throughout the day.

Of course, if two days or more pass and he does not eat anything, take him to the vet as soon as possible.

Physical causes



The cat is an animal that can be affected by different types of cancer, just like humans: skin, bone, lung, heart … Weight loss is the symptom that is usually common in all of them, but not is the only one : vomiting, poor appetite or diarrhea are just a few others you may have.

This disease is more common in older furry, eight years or older, but do not lower your guard. If you suspect that your friend suffers from it, do not hesitate: take him to the specialist to treat him with chemo or radiotherapy, or surgery as the case may be.


Diabetes is a disease that appears when the pancreas does not produce enough insulin , which is in charge of metabolizing glucose, which is then transformed into energy. Thus, the blood sugar level rises, which can increase the cat’s appetite; However, as he will not be able to metabolize it, he will lose weight and you will surely see him drink much more water than normal.

Treatment may consist of specific medications, insulin injections, or changes in diet .

Kidney disease

The kidneys are the purifiers of the body. They are the ones that filter toxins, thus preventing them from ‘contaminating’ the blood. But when they start to fail, these toxins build up, causing the cat to lose weight and appetite , difficulty urinating, and lethargy.

To help him get back to normal life, it is important to take him to the vet for a prescription. You may also have to change his diet and give him foods low in protein, phosphorus and sodium.


It is a disease caused by an overproduction of the thyroxine hormone , which is produced by the thyroid gland. The excessive amount of this hormone increases the metabolism of the cat, which makes it need to be much more active. Plus, the food your body eats is processed faster, so you hardly have time to absorb the nutrients you need.

Other symptoms that it may present are high blood pressure and kidney problems, so it is very important to consult a veterinarian for treatment , which can be with medication, radioactive iodine therapy or surgery.

Internal parasites

Cats can have many serious problems with internal parasites. If your friend has, you will see that he eats a lot, eagerly, but hardly gets fat . When the infestation is severe, you will notice a swollen, tender abdomen.

The best thing to do is put him on antiparasitic treatment . The professional will give you syrup, pills or antiparasitic pipettes (depending on what he considers appropriate) that you will have to give to your cat.

Oral-dental problems

The mouth is the gateway to food. When the cat is in pain or discomfort, it may not want to eat and consequently loses weight . This becomes more evident as he gets older: the accumulation of tartar causes infections in the teeth, which discourage the feline from taking any bite.

If you see that he does not feel like eating, if he chews with difficulty, and / or if his breath smells bad, take him to the vet to examine him and treat him with medication. In very serious cases, you may have to have a tooth removed.

Old age

Over the years, the body gradually wears out. When it reaches 10 years (more or less) the muscle mass is lost, so that the weight of the animal is reduced . You don’t have to worry more than necessary; You simply have to take care of him by giving him much more pampering and affection so that he knows how much you love him, which will give him strength to move on.

How to prevent my cat from losing weight?


There are several things you can do to keep your cat from losing weight early:

  • Give him a quality diet, without cereals and very rich in animal protein. This is how you can strengthen the immune system.
  • Take care of it as it deserves. And I don’t mean just to give him food and water, but also to worry about him. Play with him every day, pick him up and give him a few kisses (without weighing him down). Show him how much you care. Everyday. Until the end.
  • Take him to the vet whenever necessary. You must receive all your vaccinations , and special care if you are in an accident or fall ill.
  • At home, avoid noise, tension, and loud music. It is a very sensitive animal that stresses very quickly.
  • Make the introductions little by little. If you intend to give him a cat companion, introduce them little by little and gradually, exchanging their beds and being very patient. In this article you have more information.


As we have seen, there are several reasons why a cat can lose weight. I hope you were able to find your friend’s cause 🙂.



People Also Search For

my cat is losing weight and hair
what to feed an older cat that is losing weight
cat losing weight in summer
my cat is so skinny i can feel her bones
cat weight loss calculator
how skinny can a cat get before it dies
why is my cat thin at the back end
cat losing weight in hindquarters


People also ask

What should I do if my cat is losing weight?

Is it normal for cats to lose weight as they age?

How much weight loss is too much for a cat?

What are the signs that a cat is dying?

At what age do cats usually die?

Is it OK to let my cat die naturally?

What is the average lifespan of a house cat?

Why did my cat suddenly lose weight?

How many times a day should I feed my cat?

What can I feed my old cat to lose weight?

Should you feel a cat’s spine?

What are the symptoms of a cat dying of kidney failure?

What is the best weight loss food for cats?

What is a healthy weight for a cat?

How much should I feed my cat to lose weight?

Leave a Comment

Your email address will not be published. Required fields are marked *