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Underweight Cat | Common Health Issues and Solutions

Underweight Cat | Causes and Prevention

Our beloved cats can. Lose weight just like we humans can do too? Have a look at our tips for spotting signs that your kitty may be too skinny and how you can assist them in getting back, into good shape.

Having an underweight cat can be a sign of underlying issues, whether it's due to the wrong type of cat food or more serious health concerns like kidney disease. If your cat is losing weight, it's important to figure out the cause so you can help them regain a healthy weight. Factors such as your cat's breed, activity level, and overall body condition play a significant role in determining whether they are underweight or obese. If you can easily feel your cat's ribs or spine without much fat covering, or notice a visible belly tuck when viewing them from the side, it could indicate weight loss that needs addressing. In this article, we’ll discuss the potential causes of weight loss in cats, the role of high-protein and high-fat cat food, and how to help your skinny cat achieve an ideal weight. We’ll also provide guidance on choosing the right dry kibble and knowing when it’s time to consult a vet for a thorough check-up to ensure your cat stays healthy and at an appropriate weight.

Is my cat too skinny?

Being a cat parent means striving for the well being of our beloved feline friends. In check ups at the vets office, for shots and check ups your kitty will probably get a weigh in and your vet may address any weight related issues if necessary.


When trying to check if your cat is underweight at home by weighing it may not always give you the precise results due to cats varying in breeds and sizes. For an accurate assessment of your cats weight status it is important to consider their body condition rather than just focusing on the numbers, on the scale. If you notice your cat looking thinner or losing weight gauge their body condition to see if they are maintaining a weight.


Signs that your cat might be underweight include:


  • Being able to see their ribs easily, especially in short-hair breeds.
  • A very distinct waist behind their ribs when viewed from above.
  • A clear belly tuck behind the ribs when viewed from the side.
  • The visibility of their spine, with little to no fat covering the rib and spine area.

However, if your cat is at a healthy weight, you should:


  • Be able to feel their ribs, but not see them, as there should be a slight fat covering.
  • Feel their backbone, but it shouldn't be visible.
  • See a slight waist tuck behind the ribs when looking down at their back.

If you're worried about your cat losing weight you can consider changing their diet to include protein or high fat cat food options and dry kibble to help them put on some pounds. Also a visit to your vet for an examination is crucial specially if you have concerns about possible underlying health problems such, as kidney disease that might be contributing to your cats weight loss.

Cat laying down showing his underweight ribs.

Risks of having an underweight cat

The risks associated with a cat can vary based on the amount of weight they shed and the speed at which it occurs. If your cat transitions, from appearing healthy one day to looking thin after it suggests an underlying issue.


When a cat is too skinny it can be risky because they might not be getting nutrition they need to stay healthy and fight off sicknesses like kidney disease with their body's defenses.


An undernourished kitty may exhibit vitality and diminished inclination to play around which could impact not just the felines health but also your emotional state, in the long run.


In summary, if your cat has lost weight and isn’t naturally thin for their breed, it’s important to address the issue. Ensuring they receive proper cat food to help gain weight and scheduling a vet check are crucial steps in maintaining their health.

A very thing hairless cat.

What to do if your cat is underweight

If you suspect your cat is underweight, schedule an appointment with your vet. They are best equipped to evaluate your cat’s body condition and determine if there are any underlying medical issues, such as kidney disease, contributing to weight loss. Pay attention to changes in your cat’s appetite, as a decreased interest in food can indicate health problems.


Your vet can provide tailored advice to help your underweight cat gain weight, which may include recommending a special diet with high-protein and high-fat cat food or prescribing medication to address any identified conditions. If there are no clear medical reasons for the weight loss, your vet can assist in uncovering the cause and developing a plan to improve your cat's health and overall weight.

What causes cats to lose weight

Cats can lose weight for several reasons, including:

1. Age

As cats get older they are more prone to health issues that can impact their weight and muscle strength. It's important to keep a close eye on their well being and make sure they have regular check ups, with the vet to address age related issues effectively.

2. Medical Problems

Various health issues in cats such as problems, gut troubles, arthritis, thyroid and kidney diseases can result in weight loss. It is crucial to plan check ups for your cat especially if they are older than eight years old – ideally twice a year with the vet being seen regularly. Provide preventive care like flea and worm treatments along, with vaccinations is essential too If you observe your cat losing weight promptly consult your veterinarian

3. Stress

Cats feeling stressed might eat less. Lose weight as a result of it. It's important to identify and deal with stress triggers, in cats to avoid this problem.

4. Increased Activity

For outdoor cats, particularly during the summer months, increased exploration and activity may contribute to weight loss. The extra exercise can lead to a reduction in body weight.



Ensuring your cat eats a balanced diet with high-protein and high-fat cat food can help them gain weight if they're underweight. Regularly check their body condition to see if their ribs are easily felt, and seek advice from your vet if necessary.

A malnourished cat.

How to encourage an underweight cat to eat more

Just like people, cats don’t always reveal the full story about what they’re eating and when.


Even if you’re providing cat food, it doesn’t guarantee that your cat is eating it or keeping it down. To monitor your thin cat’s food intake, setting regular mealtimes is a good approach. An automated pet feeder can help maintain this schedule if you’re not at home.


Alternatively, if your underweight cat prefers to eat small amounts frequently, free feeding might be a suitable option. As long as they’re consuming the necessary daily calories, both methods can help your cat gain weight effectively.


Here are some tips to encourage a skinny cat to eat more and help them gain weight:


  • Place food away from their litter box, as cats don’t like their eating area near their toilet.
  • Keep their food and water bowls separate, allowing space between them.
  • Position the food away from doors to help your cat feel secure while eating.
  • Offer high-quality cat food suited to their age—kitten food for kittens, adult food for mature cats, and senior food for older cats.
  • If your cat is not eating, consider changing their food, as they may refuse certain options without clear reasons.
  • If set mealtimes aren’t working, try free feeding to allow them to graze throughout the day.
  • Give them wet and dry food, with dry food available for eating between meals.
  • Use a puzzle feeder to encourage your cat to find fun in eating.
  • Utilize a water fountain to encourage hydration by simulating running water.
  • Observe mealtimes from a distance to notice any changes in behavior.
  • Clean your cat’s food and water bowls daily.
  • Remove strong colors, smells, and stimuli from around their feeding area.
  • Add healthy treats to their diet, such as fresh fish, tuna (in oil or water, not brine), or plain cooked chicken.

Try these strategies to see if your underweight cat begins to gain weight. If there’s no improvement, consider scheduling a vet check to address any underlying issues, such as kidney disease or other causes of weight loss.

Helping your cat gain weight

A thin or skinny cat is not in their ideal condition. They should have enough fat to protect their organs and keep warm, but not so much that they wobble as they walk!


While cats usually regulate their food consumption independently there are moments when they require a bit of help.


If you notice symptoms of an underweight cat, it could be a sign of weight loss that requires attention. It’s generally not a major concern unless the weight loss was rapid, but you should take steps to address it.


If efforts to help your cat gain weight aren’t working, or if you’re worried, take your cat to the vet for a thorough check-up. It’s always better to ensure your cat’s health is monitored, especially if there might be underlying issues like kidney disease.

An ill cat wrapped in a blanket being cuddled by owner.

Is my cat severely underweight?

Determining if your cat is severely underweight involves assessing their body condition. If you can easily feel their ribs and spine, see a pronounced waistline, or notice a visible belly tuck, these could be signs of significant weight loss. A severely underweight cat may also appear lethargic and have a noticeable lack of fat covering. For an accurate assessment, compare your cat's weight with the average weight chart below to see if they fall into the underweight category.

Cat Breed Weight Chart

Cat Breed

Female (kg)

Male (kg)

Abyssinian Cat 2.7 - 4.5 3.6 - 5.4
American Wirehair 3.6 - 5.4 4.5 - 6.8
Asian Cat 2.7 - 4.5 3.6 - 5.4
Australian Mist 3.2 - 5.0 4.1 - 5.9
Balinese 3.6 - 5.4 4.5 - 6.4
Bengal Cat 3.6 - 5.4 4.5 - 6.8
Birman 3.6 - 5.4 4.5 - 6.4
Bombay Cat 2.7 - 4.5 3.6 - 5.4
British Longhair 4.1 - 6.4 5.0 - 7.3
British Shorthair 3.6 - 5.4 4.5 - 6.4
Burmese Cat 2.7 - 4.5 3.6 - 5.4
Burmilla Cat 3.6 - 5.4 4.5 - 6.4
Chartreux Cat 3.2 - 5.4 4.5 - 6.8
Chinchilla Cat 2.7 - 4.5 3.6 - 5.4
Cornish Rex 2.7 - 4.5 3.6 - 5.4
Cymric Cat 4.5 - 6.8 5.4 - 7.7
Devon Rex 2.7 - 4.5 3.6 - 5.4
Egyptian Mau 3.2 - 5.0 4.1 - 5.9
Exotic Shorthair 3.6 - 5.4 4.5 - 6.4
Japanese Bobtail 2.7 - 4.5 3.6 - 5.4
Korat 2.7 - 4.5 3.6 - 5.4
LaPerm 2.7 - 4.5 3.6 - 5.4
Lykoi 3.2 - 4.5 4.1 - 5.4
Maine Coon 4.5 - 6.8 5.4 - 8.2
Manx 3.6 - 5.4 4.5 - 6.4
Munchkin 2.7 - 4.5 3.6 - 5.4
Nebelung 3.6 - 5.4 4.5 - 6.4
Norwegian Forest 4.5 - 6.8 5.4 - 8.2
Ocicat 3.6 - 5.4 4.5 - 6.4
Oriental Long Hair 2.7 - 4.5 3.6 - 5.4
Oriental Short Hair 2.7 - 4.5 3.6 - 5.4
Persian Cat 3.6 - 5.4 4.5 - 6.4
Pixiebob 3.6 - 5.4 4.5 - 6.4
Ragamuffin 3.6 - 5.4 4.5 - 6.8
Ragdoll Cat 4.5 - 6.8 5.4 - 9.1
Russian Blue 3.6 - 5.4 4.5 - 6.4
Savannah 5.4 - 9.1 6.8 - 11.3
Scottish Fold 2.7 - 4.5 3.6 - 5.4
Selkirk Rex 3.6 - 5.4 4.5 - 6.4
Siamese 2.7 - 4.5 3.6 - 5.4
Various cats, different cat breeds and different sizes.

FAQ

How do I fatten up my cat?

To help your cat gain weight, offer high-protein, high-fat cat food and consider feeding them multiple small meals daily. Ensure they are eating enough by checking their intake and consult your vet for specific advice. For more information on suitable foods, check out What can cats eat?.

Can stress cause a cat to lose weight?

Certainly! Stress has the potential to make a cat shed some pounds on the scale for sure! When felines are under stress or feeling anxious about something in their environment or routine changes; they might not feel like eating much or may even turn down food entirely leading to weight loss as a consequence of that stressor being present in their lives at the time. It's vital to spot what exactly is causing stress in your cats life and work towards easing those triggers out of their environment for sailing ahead so that your furry friend stays healthy and happy! For valuable insights, on how stress impacts cats and ways to effectively handle it with care and concern; make sure to explore further into the realm of Cat Stress management techniques and tips.

How often should I feed an underweight cat?

To help a cat put on weight and increase their calorie intake it's best to give them small meals throughout the day rather, than large ones so they can eat regularly without getting too full at once and adjust the portion sizes based on their calorie needs while also offering a combination of wet and dry food to keep them engaged and ensure a balanced diet is provided. It's important to consult your vet if necessary to develop a feeding schedule that supports your cats health and helps them reach their weight goals successfully.

Should I switch my cat’s food if they are not eating?

Yes, if your cat is not eating their current food, switching to a different brand or flavor may help stimulate their appetite. Cats can be finicky and may refuse food for various reasons, including taste preferences or texture. Opt for high-quality, high-protein, and high-fat cat food to encourage consumption and support weight gain. If the problem persists despite trying different foods, it’s important to consult your vet to rule out any underlying health issues and to receive tailored advice for your cat’s dietary needs.

What role does hydration play in weight gain?

Hydration plays a crucial role in weight gain for cats by supporting overall health and efficient digestion. Adequate water intake helps maintain a healthy appetite, aids in nutrient absorption, and ensures proper digestion of food, which can contribute to effective weight gain. Cats that are well-hydrated are more likely to have normal bowel movements and better overall health, both of which are essential for gaining weight. Providing fresh, clean water and considering wet cat food can help ensure your cat stays properly hydrated, supporting their journey to a healthier weight.

Are there any supplements that can help my cat gain weight?

Certainly! There are products you can use to help your cat gain weight such as calorie nutritional gels and powders designed specifically for the nutritional needs of cats. These supplements aim to provide calories and essential nutrients that may be lacking in their regular meals. Look for options, with an amount of protein and fat to assist in weight gain. However it is important to consult your veterinarian before using these supplements as they can recommend choices based on your cats unique health conditions and dietary requirements.

When is it time to consider a vet check for my cat’s weight issues?

If your cat remains thin despite changing its diet or experiences weight loss it might be a good idea to take it to the vet for a check up. Other reasons to visit the vet include a loss of appetite unusual behavior changes and symptoms such, as vomiting or diarrhea. It's important to have your cat thoroughly checked by a vet to uncover and deal with any health issues like metabolic disorders or long term illnesses that might be causing weight loss and to create a treatment strategy, for your cats weight and well being.


Kelly Rushton with her cat Eddie Stafford.

Kelly Rushton

Meet Kelly Rushton, a dedicated cat enthusiast and proud owner of Feline Fancy Ltd. With a heart as big as her household, Kelly is the loving mum to 10 charming Ragdoll cats. In her world, felines reign supreme, and she brings professionalism and warmth to everything she does. Through her blog, Kelly shares her wealth of knowledge and experiences, offering insights into cat care, behavior, and the joy of living alongside these majestic creatures.


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