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."







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
“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:
FREE Shipping Above $30
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!

$21.99
Recommended

$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.
Ingredients
Malt syrup, soybean oil, corn syrup, cane molasses, salmon oil, dl-alpha tocopherol acetate (vitamin E), sodium benzoate (preservative), manganese sulfate, magnesium sulfate, calcium pantothenate, niacinamide, iron proteinate, pyridoxine hydrochloride, vitamin A acetate, thiamine hydrochloride, mixed tocopherols, sodium chloride, trisodium phosphate, riboflavin, potassium iodide, choline bitartrate, d-activated animal sterol (vitamin D3 supplement), folic acid, vitamin B12 supplement
Directions
To acquaint your cat with the flavor, place a small amount of gel on its nose or in the mouth.
To supplement your cat's caloric or nutritional intake: 5 cc (or 1 teaspoon) per 10 pounds of body weight daily.
When your cat is not eating its full ration: 10cc (or 2 teaspoons) per 10 pounds of body weight daily.
Shipping & Returns
Standard Shipping (arrives in 5-8 business days)
All orders above $30 are eligible for free shipping! Please note that we only ship to addresses in the lower 48 of United States. We do not ship internationally or to AK/HI at this time.
Expedited Shipping (arrives in 2-3 business days)
Flat rate of $19.99 USD. Orders placed before 3pm EST Monday - Friday (non holidays) ship the same day. In-stock items are normally shipped within 1-2 business days. Expedited and overnight shipping options are not available to Hawaii, Alaska and PO Boxes. We do not ship on holidays.
Hastle-free Returns
We are happy to accept returns of unopened, unexpired products purchased directly from our website within 30 days of purchase. Please note, we DO NOT accept returns of opened or expired products. We also do not accept returns of items purchased from Amazon or other retailers.
Please send your returns using the carrier of your choice to:
Under the Weather Pet (ATTN: Returns)
1360 Marshall Avenue Williston, VT 05495
Please ensure to include your name and order number.
Once your return has been processed, it may take 3 - 10 days for the refund to be posted to your account.
Every product we manufacture has been developed in close collaboration with verterinarians - that means they’re safe, and they work!
All of our products are manufactured right here in Vermont, USA, always using the highest quality ingredients.
Your hands are already full taking care of your furry friend. Save the trips to the store with our fast shipping!
Overall rating: 4.3036647 / 5 from 191 reviews.
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.
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"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."
"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."
"Second order. . my senior kitty loves it. She was losing weight and finicky. . it’s helping her appetite."
"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.."
"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."
"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."
"My 15 year old Rocky is loosing weight, he likes this so I feel comfortable giving him the extra calories."
"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"
"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"!"
"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."