Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

How Do I Get My Cat to Gain Weight? Our Vet Answers With Infographic

Share

tabby cat eating from metal bowl

Monitoring your cat’s weight is a great way to get a hint about how well they are eating and if their overall health is on track. Kittens should steadily gain weight until they reach adulthood, after which, their body weight should be maintained. If you notice your cat losing weight, you are right to be concerned. There are several reasons that your cat may suddenly lose weight, and some of these can be caused by serious illnesses. Read on to learn more about how to monitor your cat’s body weight and what to do if your cat is too thin.

divider 2 cats

How Do I Know If My Cat Is Underweight?

Even if your cat isn’t rapidly losing weight, you might be concerned if they appear to be too thin. The best way to tell if your cat is underweight is by evaluating their body condition score (BCS). The BCS is used to describe a cat’s body shape and can be used for all breeds of adult cats. The score ranges from 1 to 9, with 1 describing a cat as “severely underweight” and 9 as “morbidly obese.” An ideal score on this scale is 5.

A cat with a BCS of 5 will have a visible waist when observed from above, and the ribs should not be visible but easily felt with a slight amount of pressure. You can take a look at the score chart from the World Small Animal Veterinary Association1  to get a better idea of where your cat sits on this scale.

If you notice that your cat’s ribs and spine are prominent on your cat’s body, they are underweight and likely have a BCS below 4. This should prompt an appointment with the veterinarian to get your kitty checked out for any serious illnesses.

Ideal Cat Cat Weight Illustration

Cat Body Condition Score Healthy Weight
You are free to use this image but we do require you to link back to Catster.com for credit

divider 2 cats

How to Get an Older Cat to Gain Weight?

Cats are known to gradually lose weight when they become seniors at around 12 years of age. Even though this is common, you should still book yearly appointments with your veterinarian to ensure that your cat’s health is on track. As cats enter their golden years, they may have a reduced ability to digest and acquire the nutrients in their food.

You may want to choose a food with a high caloric content and protein content to counteract any decreases in digestibility and loss of muscle mass. Another thing to consider in older cats is that they may have a decreased ability to smell and taste their food. One adjustment that can overcome this is the use of a high-moisture canned diet, which readily releases aromas and is more flavorful than dry kibble.

What If My Cat Is Losing Weight?

If your cat is visibly losing weight and is not specifically on a weight-loss plan, this can be a sign of a health problem. It is best to get an appointment with your veterinarian to discuss your cat’s weight loss and any other signs that may indicate the presence of illness. Common illnesses that cause cats to lose weight include hypothyroidism, kidney disease, and diabetes. Since both hyperthyroidism and diabetes cause hunger, many pet parents don’t notice their cat losing weight at first.

grey cat eating meat
Image Credit: Chendongshan, Shutterstock

divider 2 cats

What Can I Feed My Cat to Gain Weight?

Ultimately, your cat will have to eat more calories than they are using on a daily basis to gain weight. However, this doesn’t mean that they should just get more treats! Only up to 10% of your cat’s daily caloric intake should come from treats, even when they are trying to gain weight.

Choose a diet with a high caloric density that is still nutritionally balanced. There should be a statement on the label that says that the diet is complete and balanced for adult cats or all feline life stages. With a wide variety of textures and flavors available commercially, you should be able to find a diet that will match the specific preferences of almost any cat!

How Many Calories Exactly?

Your veterinarian can help you calculate exactly how many calories your cat should be consuming per day. They will take into account whether your cat has been spayed or neutered and their activity level. They will then work out how many grams (or ounces!) of your chosen food this equates to. When measuring out meals to meet this requirement, use a weighing scale, as cups are not accurate.

You will need to weigh your cat regularly and may need to reduce their calories once they start to gain weight—you don’t want to tip them over into obesity!

divider 2 cats

Are There Any Supplements That I Should Use to Get My Cat to Gain Weight?

There are no specific supplements that are recommended to give to cats to help them gain weight. Adding supplements to meals can cause a diet to become imbalanced and lead to nutrient deficiencies. Consult with a veterinarian before deciding to add something to your cat’s diet over the long term.

My Cat Really Doesn’t Like Any Commercial Foods! Can I Cook for Her?

Everyone loves a home-cooked meal! Unfortunately, it isn’t as simple as throwing together some nice-looking ingredients together in a bowl when it comes to your cat. If meals are not complete and balanced, nutrient deficiencies can develop over time. If you are keen to cook for your cat, source your recipes from a board-certified veterinary clinical nutritionist. They can work with you to create a tailored meal plan that matches your cat’s needs and preferences.

divider 2 cats

Why Is My Cat Not Eating?

Assuming your cat is otherwise well, there are some things that can put a cat off their food. Cats are prey animals and may not eat if they feel under threat.

Lazy and well-fed cat looking for food and not eat
Image Credit: Elena Kutepova, Shutterstock

Cat Mealtime Anxiety

Something to look out for as a reason that your cat may not be eating enough is anxiety surrounding mealtime. Ensure that there isn’t anything that may be stressful in the environment preventing your cat from eating comfortably. Any changes in the household, including the introduction of a new person or the rearrangement of furniture, can cause unease and inappetence.

Cat Food Bowl Access

Questions to keep in mind when considering your cat’s food bowl are:
  • Can your cat easily get to the food bowl at all times? — If the food bowl is at a height, make sure your cat can easily reach it. Older cats may start to struggle with arthritis, making it harder for them to reach their bowl. The same consideration should be taken for bowls that are in rooms that are very busy during the day, as shy cats may be hesitant to eat even when they are hungry.
  • Is there any competition in the household for the food bowl from other pets? — If your cat is fed freely with other cats in the home, make sure that there is at least one bowl per cat, plus one extra. This will prevent resource guarding and bullying for food among household companions. You may need to feed shy cats in other rooms to help them get enough to eat.

divider 2 cats

Conclusion

Most cats are overweight, not underweight, so before you embark on a mission to get your cat to gain weight, it’s best to check with a veterinarian that weight gain is needed. They can also make sure there’s nothing amiss that might explain why your cat is underweight.

Once your vet has given you the go-ahead, they’ll help you work out how many calories your pet needs to eat. You may also need to look at your cat’s home environment to make sure they’re getting all the food they need.

See Also: 


Featured Image Credit: Marina Demidiuk, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

Your Cat Isn’t Picky – Their Nose Is Just Bored

If you’ve ever sighed while scraping uneaten cat food into the trash, you’re certainly not alone. Many cat owners know the routine: their...

Ask Dr. Paola – Help! My Kitten Won’t Use the Litter Box! (July 27, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

Chatting with Petra Luna About CatCrazy, Cat Food Ingredients & The Secret of E-Beams | Chatty Cattys, Episode 28

In this episode of Catster’s Chatty Cattys podcast, Nicole and Dr. Karyn welcome back Petra Luna from CatCrazy to catch up on her...

According to Vets, Most Owners Miss These Signs That a Cat is Sick

Cats are famously good at hiding discomfort. It is not stubbornness or indifference; it’s a deeply ingrained survival instinct. In the wild, showing...

More related

Yochabel’s Wisdom: A Cat’s Last Day & Letting Go

This is the seventh in a series of posts by Casey Hersch. Casey discusses the many lessons she learned about caring for Yochabel...

8 Best Kitty Cat Condo Cat Trees in 2026 – Reviews & Top Picks

Cats love to jump, climb, and lounge in high areas, just like their wild counterparts. Cat condos offer multiple ways for cats to...

Why Do Cats Like Their Butt Scratched? (7 Interesting Reasons)

It’s happened to just about every cat person. You come in for some cuddles, but your cat only turns around and presents their...

Why Does My Cat Have Whiskers on Their Eyebrows? Vet-Verified Facts & Functions

Though whiskers above the mouth are a standout feature in cat anatomy, whiskers in other areas are less conspicuous. In addition to the...

Keep reading

How Many Hours a Day Do Cats Groom? Vet-Reviewed Behavior Explained

Imagine spending half of your waking hours in the shower every single day. While that might seem exceedingly boring and tedious to us, cats spend approximately 2–5 hours grooming themselves every day, which is between 30% and 50% of their...

bengal cat grooming itself

Why Does My Cat Chirp at Birds? 3 Vet-Verified Common Reasons

Your cat may seem like a cuddly ball of fur or even a hairless wonder who loves to spend time with you under the blankets, but something changes when your feline sees a bird outside the window. Instantly, your kitty...

cat watching bird on the window

Is It Ok to Put Ice Cubes in a Cat’s Water Bowl? Vet-Reviewed Pros & Cons

Most cat owners know that keeping a cat hydrated can sometimes be a challenge. Hydration is important for cats, and it’s even more important in the hot summer months. However, getting a cat to drink water is not always easy,...

Woman putting ice cubes into pack

The 10 Common Causes of Sudden Death in Cats (And Which Ones Are Preventable)

Most cat owners don’t think much about heart disease, internal hemorrhage, or viral infections until they’re staring at an empty bed. Sudden death in cats is one of those topics that feels too heavy to think about proactively, but understanding...

sick cat lying on blanket

Can Cats Eat Prunes? Risks & Safe Alternatives

For humans, the health benefits of antioxidant-packed dried plums can’t be understated. They’re commonly eaten to ease constipation and nausea. Therefore, you may be wondering if you can give prunes to your cat. Unlike humans, cats shouldn’t eat plums or...

Can Cats Eat Prunes

Where Do I Put Cat Food & Water Bowls? 6 Vet-Reviewed Options

Though the placement of your cat’s food and water bowls may seem like a minor consideration, it is a lot more important than some may think. Cats are fastidious animals that need routine and love having a calm, quiet, safe...

owner feeding his cat

Tiny Tiger Cat Food Review of 2026: Recalls, Pros & Cons

Review Summary Tiny Tiger is a cat food brand that’s sold exclusively on Chewy. However, Chewy does not state who manufactures Tiny Tiger cat foods, except that it is made in North America. They mention that some of their ingredients...

Tiny Tiger Cat Food Review

Is Lethargy Normal After Surgery In Cats? Vet Approved Care & Health Facts

Whether it’s a routine operation or major surgery, cats need time to recover after any surgical procedure. They need extra care and attention, although some cats will prefer to be left alone rather than fussed over. Your vet should give...

vet putting on surgical suit to a cat after surgery

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.