Ready Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100ccReady Cal® High-Calorie Supplement For Cats - 100cc
Ready Cal® High-Calorie Supplement For Cats - 100cc

When cats stop eating—whether they’re old, sick, or just tiny—this high-calorie gel gives them the nourishment they need to bounce back.

Provides essential calories to promote weight gain

Stimulates appetite

Packed with 10 vitamins, 7 minerals

Boosts energy

Person with a kitten on their shoulder, wearing a denim jacket, in a garden.

“This product literally saved my kitties life. We had been to 4 vets and none of them could explain or cure her ongoing diarrhea. They did multiple tests, changed her food, put her on medications, but nothing worked. After using this product for 2 weeks she was a normal kitty. She is no longer a " splat cat" and she has been able to gain weight, eat normal food, and have a great life😊”

Melanie

Verified Buyer

Purchase Options:

$24.99
1

FREE Shipping Above $30

CUSTOMERS USUALLY BUY

Maximize Your Cat's Caloric Intake with This Recommended Duo!

The syringe is perfect for quick, measured calories, while the powder can be mixed into food for a sustained calorie boost throughout the day. Ensure your cat gets the total care they need to thrive!

Tube of high-calorie food supplement for cats with dosage markings.

Ready Cal High-Calorie Supplement For Cats

$21.99

Recommended

Cat food topper, labeled 'Ready Cal,' high-calorie savory chicken powder.

Ready Cal High Calorie Powder for Cats

$24.99

FREE Shipping included.

Product Details

Ready Cal is an easy to use high calorie nutritional supplement that helps to provide the essential calories your cat needs daily to gain or maintain a healthy weight. 

When our cats do not feel up to eating, it can cause low energy, depressed mood, and weight loss, which can quickly lead to malnutrition and further health issues.


This supplement helps to provide essential calories for cats that are not eating enough to maintain a healthy weight. Ideal for cats in their 'golden years' where maintaining weight is critical for slowing down the aging process.


Made in the USA with ten vitamins, seven minerals, and essential fatty acids, our vet formulated gel is designed for cats and kittens of all ages who may not be eating normally due to reasons such as stress, age, medical procedures, or illness.


Comes in a dial-a-dose tube for accurate dosing, with a natural fish taste cats love. Manufactured without artificial flavors or dyes.

  • Veterinarian Formulated

    Every product we manufacture has been developed in close collaboration with verterinarians - that means they’re safe, and they work!

  • Manufactured in the USA

    All of our products are manufactured right here in Vermont, USA, always using the highest quality ingredients.

  • Fast Shipping

    Your hands are already full taking care of your furry friend. Save the trips to the store with our fast shipping!

 

Over 250,000 pets helped

What Customers Are Saying

Health

Improvements

Convenient and

Reliable Solutions

Picky Eater

Approval

Excellent

Customer Service

A black dog with a blue collar sits beside a packet of dog food and a bowl.

muddypawsrescuenyc When he first arrived, he was in a bit of rough shape. He was found as a stray, so no one knows exactly what his past was like. All we know is that his future is as bright as his smile! After a few bags of @undertheweatherpet Chicken and Rice (which he gobbled up too fast for us to catch a good photo, yum!), and continuing medication for his stiff joints, Tavo is perking up and has blossomed into the most perfect gentleman.

A pit bull rests its head and paw on a cozy, patterned blanket.

Aimee L.

Amazing results fast! Our Pitty was having a flare up and I decided to try this. He is now holding his leg up sturdy to pee again and has more energy it seems. I can definitely tell this product works! Definitely worth the money! Thank you!

Golden Retriever looking at Under the Weather Rice & Chicken dog food packet.

olivemygolden The greatest product ever invented (especially if you have a golden that will eat anything ). I always keep some on hand & they always get used up @undertheweatherpet

A tabby cat sitting beside various cat health supplements.

Dawn P.

We love it!

Finally found a powder for my picky eaters! My cats don't like seafood flavored anything. It was a great relief to find this product. They happily eat it mixed with their wet food.

Husky with different colored eyes sits on the floor with pet food and supplements.

Instagram User Thank you @undertheweatherpet for all the wonderful products! Being a foster/rescue mom 🐾 and having rescued an anxious and picky husky 🐶, I can really appreciate your products!


We have freeze dried bland diet for dogs (a quick food replacement when I’m in a pinch - and SUPER healthy for your dog), hemp calming treats for prone to stress pups, and (I know we don’t want to talk about it, but so needed!) anti-diarrhea to help firm up those loose poops 💩!


Skye definitely is an Under the Weather Pup!

Spotted dog lying on a dark grey ottoman in a modern living room.

Gretchen G.

No longer ‘Under the Weather!’ Our 15 year cocker, Peanut, has multiple issues and most foods make her so sick and unhappy. But now she is dancing for dinner again. Also, she gets happy when she sees the kettle boiling as she knows what’s coming! Thank you for making such a good product for fur babies.

A black dog with a blue collar sits beside a packet of dog food and a bowl.

muddypawsrescuenyc When he first arrived, he was in a bit of rough shape. He was found as a stray, so no one knows exactly what his past was like. All we know is that his future is as bright as his smile! After a few bags of @undertheweatherpet Chicken and Rice (which he gobbled up too fast for us to catch a good photo, yum!), and continuing medication for his stiff joints, Tavo is perking up and has blossomed into the most perfect gentleman.

A pit bull rests its head and paw on a cozy, patterned blanket.

Aimee L.

Amazing results fast! Our Pitty was having a flare up and I decided to try this. He is now holding his leg up sturdy to pee again and has more energy it seems. I can definitely tell this product works! Definitely worth the money! Thank you!

Golden Retriever looking at Under the Weather Rice & Chicken dog food packet.

olivemygolden The greatest product ever invented (especially if you have a golden that will eat anything ). I always keep some on hand & they always get used up @undertheweatherpet

A tabby cat sitting beside various cat health supplements.

Dawn P.

We love it!

Finally found a powder for my picky eaters! My cats don't like seafood flavored anything. It was a great relief to find this product. They happily eat it mixed with their wet food.

Husky with different colored eyes sits on the floor with pet food and supplements.

Instagram User Thank you @undertheweatherpet for all the wonderful products! Being a foster/rescue mom 🐾 and having rescued an anxious and picky husky 🐶, I can really appreciate your products!


We have freeze dried bland diet for dogs (a quick food replacement when I’m in a pinch - and SUPER healthy for your dog), hemp calming treats for prone to stress pups, and (I know we don’t want to talk about it, but so needed!) anti-diarrhea to help firm up those loose poops 💩!


Skye definitely is an Under the Weather Pup!

Spotted dog lying on a dark grey ottoman in a modern living room.

Gretchen G.

No longer ‘Under the Weather!’ Our 15 year cocker, Peanut, has multiple issues and most foods make her so sick and unhappy. But now she is dancing for dinner again. Also, she gets happy when she sees the kettle boiling as she knows what’s coming! Thank you for making such a good product for fur babies.

Overall rating: 4.3036647 / 5 from 191 reviews.

AI Generated Review Summary

Ready Cal® High-Calorie Supplement for Cats is a product designed to help cats maintain optimal weight and energy levels, especially as they age. It is praised for its effectiveness in improving feline health and overall well-being. Customers have mixed opinions on its taste, syringe, and the amount, but it is generally considered helpful for fussy eaters and weight management.

Summary topics

  • Eating Behavior: 6%
  • Weight Management: 14%
  • Cat Health Improvement: 32%
  • Taste Acceptance: 12%
  • Supplement Effectiveness: 12%

Review topics: [].

Review highlights

  • "My 17 year old cat really loved Ready Cal High-Calorie Supplement!"Melodie S.
  • "I still feed this to her occasionally, but she is now fully eating cat food without issues."Valerie S.
  • "She likes the flavor, no issue licking it straight off my finger."Harmonie

Reviews

Vitamin packed

"Been giving this to my baby for years now, off and on. Just to give her some extra suppliments and weight gain. She loves it."

Robin W. (5/5)

SUNNY APPROVED!

"My 13 year old cat, Sunny, wasn't eating. He slept all day. I thought it was the end, but after giving him 2 days of Ready Cal, he started eating and brought out toys for the first time in a long time. He's put on some weight. He is so picky, I didn't think he'd take it, but he seems to like it. I started by putting it on his leg and he'd lick it off. Now, he just waits for a portion on my finger."

JENNIFER A. (5/5)

❤️

"Second order. . my senior kitty loves it. She was losing weight and finicky. . it’s helping her appetite."

Barbara M. (5/5)

High cal supplement

"Using on a 14 and 17 yr( has kidney disease) old cats. The 14 yr old gained 8oz in one week. Havent really noticed a change in 17 yr old. Could be this needs to be used for longer period of time to really notice a big difference. Neither will take on their own. Having to basically scoop finger fulls into mouths.."

Genn H. (4/5)

Fatten her up

"Bought another one cause she liked it so much. She vomits when she eats too fast so I worry about her not getting enough calories and vitamins. This is a way for me to ensure I'm giving something extra to my daughter, Butters."

Me (5/5)

Happy kitty

"My kitty was bought online and I think she had food insecurities cause she over eats, VERY fast, and often vomits after. I wanted something to ensure she gets extra calories and vitamins. This is my second time purchasing."

Butters' m. (5/5)

Great stuff

"My 15 year old Rocky is loosing weight, he likes this so I feel comfortable giving him the extra calories."

Julie L. (5/5)

Thank you

"Our Tuxedo Manx had an impacted bowel. Has to be on laculose now. Was having trouble finding any food he would even try. I ordered out of despation.....between this product daily and fresh liver and gizzards he is eating regular food again. Has gained weight. And his coat is looking much better. Seems to have improved digestive tract. I believe this is what helped his severe nourishment problem. Thank you"

Rachelle W. (5/5)

A godsend!

"Currently, I have a neurological kitty with a rare "dog" disease,White Shaker Syndrome. He was very fractious and hard to medicate. I put the pills in a little "Under the Weather" high calorie paste and he would eat it right up. He's feeling a little better but came down with a terrible infection from the meds that suppress his immune system. So, I can medicate him but he's not eating. I'm giving him KMR by syringe and "Under the Weather" high calorie paste to keep him sustained nutritionally until he can smell food again. I'm telling you, this stuff is a Godsend! I recommend it to all of my Rescue Friends and have even gifted it to some of them. Especially the ones who have tiny kittens. It's an essential part of my repertoire for kittens & cats. I keep it in my "Cat Bag"!"

Karen L. (5/5)

Loved it!

"Tigger has health issues. He is an extremely picky eater but he loved it! It’s made him regular which is a plus. Still no weight gain I was hoping to see that instantly so still have hope. Enrolled in auto ship makes me feel good he’s taking in extra calories since he’s barely eating. Thank you for creating a great product."

Patty A. (5/5)

Q&A

I have a diabetic cat and see this contains molasses and corn syrup. Could this be used to treat hypoglycemia and what is the sugar/glucose amount per cc?
Absolutely. Each Teaspoon (5 grams) provides about 3,200 mg of readability available sugar in the form of Corn Syrup, Malt Syrup and Molasses. This will help boost the sugar levels in the blood. In addition it also provides B vitamins which helps as a co-factor in energy metabolism. Please be sure to see your vet before starting any supplement as every cat's health is different.
My cat is 17 years old and drinks but will not eat. I've tried to get her to eat the feed from your tube but administering it is problematic. I placed some on he paw as directed but she didn't even lick it. Is there any product you carry such as pills or eye drop administered product for infection or appetite enhancement? She will drink some of the water from canned tuna, Perhaps I could more easily feed her with an eye dropper. Do you carry them?
We do not carry a product that is administered by an eyedropper at this time. You could try mixing the gel with warm water and then giving it in a dropper.
Could this product make my kitten slobber
It is definitely a tasty product but we haven’t heard this one before! If the slobbering is frequent we suggest calling your vet just to make sure things are normal.
Is this suitable for a kitty with CKD?
This is great for cats with many different health issues, including CKD, however every cats health is different so we suggest you speak with your vet before starting!
My cat has a thyroid problem, takes med, now needs meds to protect his liver and spleen. Lost a lot of weight will this have a effect on his other meds? He is 16 and weighs 6 1/2 pounds.
While many cats benefit from Ready Cal, including those with thyroid issues, however every cats health is different so we suggest you speak with your vet about how it will interact with your cats medication.

Meet Some Of Our Happy Pets