Under the Weather Ready Cal High Calorie Powder Supplement for Cats, 5.29-oz jar

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At a Glance

  • Veterinary Diet
  • Made in USA
  • All Lifestages
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$24.99 Chewy Price
($4.73 /oz)
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About This Item

Details

  • Helps give cats with poor appetites essential calories so they can feel their best.
  • Prevents weight loss and encourages healthy weight gain in your sidekick.
  • Restores appetite for furry friends recovering from illness, stress, or medical procedures.
  • Each scoop provides 20 calories, 8 vitamins, and 6 minerals to boost energy and strengthen immunity.
  • Made in the USA and vet-formulated with a natural chicken flavor your buddy will love.

Ingredient Information

Instructions

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Questions & Answers

3 Customer Questions

How many scoops or servings per container?

Answer by Chewy • Oct 28, 2025
There are approximately 45 scoops in each jar.

How much potassium is in this?

Answer by Chewy • Oct 02, 2025
The potassium levels in this supplement are 0.35 milligram per 5 gram scoop.

How much phosphorus is in it on a dry matter base?

Answer by Chewy • Jan 05, 2026
Nutritional information beyond what is available on the product label is not available.
Reviews
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3.7
Rated 3.7 out of 5 stars
24 Ratings
Terms & Conditions

15 Customer Reviews

Rated 5 out of 5 stars
By Stephanie on Dec 8, 2025

Weight gain

Princess is 16 years old with liver problems. She's lost a lot of weight and looks scrawny. Our Vet introduced us to this powder supplement to help her gain weight

Princess is 16 years old with liver problems. She's lost a lot of weight and looks scrawny. Our Vet introduced us to this powder supplement to help her gain weight because the kind that comes in a syringe doesn't seem to make her happy. We added it to her Solid Gold wet food, as well as her dry food. She likes it! Princess gained 5lbs last month, and the Vet says she's doing much better. Thank you, Chewy!

Rated 5 out of 5 stars
By Jerald on Dec 29, 2025

Entices him to eat enough.

My cat is diabetic and when I give him his last meal of the day, I sprinkle this high calorie supplement on it to insure he eats. He gets an insulin shot when eating,

My cat is diabetic and when I give him his last meal of the day, I sprinkle this high calorie supplement on it to insure he eats. He gets an insulin shot when eating, so this makes sure he does not have any low blood glucose episodes overnight. He loves it!

Rated 5 out of 5 stars
By emily on Jan 15, 2026

Great 4 anemia from fleas/tapeworm

I got a kitten in with gums as white as snow! After a week of this in combo with the gel, he’s got most his color back! It’s nice when they don’t want wet but still

I got a kitten in with gums as white as snow! After a week of this in combo with the gel, he’s got most his color back! It’s nice when they don’t want wet but still eating kibble

Rated 5 out of 5 stars
By Leah on Dec 14, 2025

Weight gain during chemo

My cat is going through chemo currently for lymphoma. He is in remission but has to continue the full treatment. He has obviously lost weight and gets picky with

My cat is going through chemo currently for lymphoma. He is in remission but has to continue the full treatment. He has obviously lost weight and gets picky with food at times but he likes this powder and it adds extra calories to his day!

Rated 5 out of 5 stars
By Gloria on Nov 25, 2025

Great stuff! !

Just an excellent product. They use to have more of one ingredient in it, now it’s been cut back. Thank you. My cat is able to use it. Keeps her at a good weight

Just an excellent product. They use to have more of one ingredient in it, now it’s been cut back. Thank you. My cat is able to use it. Keeps her at a good weight and keeps it steady. Thank you.

Rated 1 out of 5 stars
By Pam on Oct 12, 2025
Top 250 Contributor

Cats won't touch it.

Mirra's vet said she should get more calories in her diet, as she is recovering from a stroke. She has been eating a high end pate now and I added the prescribed

Mirra's vet said she should get more calories in her diet, as she is recovering from a stroke. She has been eating a high end pate now and I added the prescribed amount of Ready Cal. She tasted it and walked away. I gave Patti Mirra's food and even though Patti likes everything, she too rejected it. Tossed it out.

Rated 5 out of 5 stars
By Paula on Oct 16, 2025
Top 500 Contributor

Very helpful product

I decided to try this product for my Sweets who began having some health issues. He seemed to like the flavor and appeared to feel a bit better after eating it but

I decided to try this product for my Sweets who began having some health issues. He seemed to like the flavor and appeared to feel a bit better after eating it but we only had the chance to use it for a few days before we ended up having to help him cross the rainbow bridge. My heart is broken

Rated 1 out of 5 stars
By Janet on Dec 18, 2025

Did nothing to stimulate my cat's appetite

Didn't help at all to stimulate Zoey's appetite! She didn't even want to eat it on her food.

Didn't help at all to stimulate Zoey's appetite! She didn't even want to eat it on her food.

Rated 1 out of 5 stars
By Ali on Jan 1, 2026

Garbage

Sick cat loosing weight so I decided to purchase it but didn't do anything!

Sick cat loosing weight so I decided to purchase it but didn't do anything!

Rated 5 out of 5 stars
By Hillary on Sep 17, 2025

My cat actually likes it!

I have tried many different things for my underweight, picky, missing-teeth senior cat. I've tried bone broth, goat's milk, Nutrical, different powders and toppers

I have tried many different things for my underweight, picky, missing-teeth senior cat. I've tried bone broth, goat's milk, Nutrical, different powders and toppers and this is the ONLY thing he will eat (besides his wet food). Worth trying if you need to add calories to your cats diet!