Ready Cal High-Calorie Cat Supplement
Verified Jun 15, 2026
This is a high-calorie, fish-flavored gel supplement for cats and kittens who need extra energy or are not eating their usual amount. It provides concentrated calories mainly from fats and sugars, along with added vitamins, minerals, and essential fatty acids. It’s intended to be used alongside a regular, complete cat diet to help support weight gain or maintenance during times of poor appetite or higher calorie needs.
Nutritionally, this product does what it’s designed to do: deliver a lot of calories in a small, palatable dose, plus a basic blend of vitamins, minerals, and fatty acids. It can be useful short term for cats who are under-eating, recovering, or need extra calories to maintain weight. It’s not a complete diet, and the calories come mostly from sugars and oils rather than high-quality protein, so it’s best used as a targeted supplement under guidance rather than a long-term primary calorie source.
The KibbleLab Score (1–10) is assessed from publicly available product data. Our evaluation is science-based, not marketing-based.
KibbleLab may earn an affiliate commission when you buy through a link. No one can pay for a higher score, or to change what we recommend for your pet.
At a Glance
KibbleLab Review
Strengths
- Very calorie-dense (about 28 kcal per teaspoon), which helps get more energy into cats who will only take small amounts of food.
- Includes omega fatty acids (from salmon oil) and a range of vitamins and trace minerals to help support overall nutrient intake when appetite is reduced.
- Soft gel texture and fish flavor are often easier to accept for picky or nauseous cats compared with dry foods or tablets.
- Clear dosing by body weight makes it easier to avoid over-supplementing calories compared with guessing with treats or table food.
Considerations
- This is not a complete and balanced diet and shouldn’t replace regular cat food; it’s meant to be an add-on for extra calories and nutrients.
- Most of the calories come from sugars (malt syrup, corn syrup, cane molasses) and vegetable oil rather than animal protein, so it doesn’t meet a cat’s protein needs on its own.
- Contains soybean oil, which may not suit cats with known soy sensitivities.
- Because it is very energy-dense and sweet, overuse could contribute to unwanted weight gain if continued once appetite has normalized.
Full Ingredient List
Ingredients and analysis reflect manufacturer data at the time of our last update and can change without notice. Always check the actual product packaging before feeding.
Ingredient filtering helps identify compatible options but is not a substitute for a veterinary elimination diet.
Top 5 Ingredients Explained
01
Malt Syrup
Malt syrup, typically derived from malted barley, is used in pet foods as a sweetener, binder and flavor enhancer to improve palatability and texture while providing rapidly digestible carbohydrates. It supplies quick energy but has little protein or micronutrients, is high in sugars and calories (which can contribute to weight gain, dental issues or worsen diabetes), may cause gastrointestinal upset if overused, and contains gluten which could be a concern for animals with rare grain sensitivities.
02
Soybean Oil
Soybean oil is used in pet foods as a concentrated fat source and palatability enhancer, providing energy and omega‑6 fatty acids (primarily linoleic acid) that support skin and coat condition. Because it is calorie‑dense and higher in omega‑6 than omega‑3, formulators balance it with omega‑3 sources to avoid an inflammatory imbalance; highly refined soybean oil is unlikely to trigger soy protein allergies but can oxidize and should be stabilized and stored properly, and it does not supply the arachidonic acid cats require from animal fats.
03
Corn Syrup
Corn syrup is a liquid sweetener and humectant used in some pet foods and treats to add simple-carbohydrate energy, improve palatability, texture and moisture retention. It provides minimal essential nutrients, can contribute to excess calories, dental disease and poor glycemic control, and is of limited benefit for obligate carnivores like cats (which have reduced sensitivity to sweet tastes), so its use should be limited—particularly for overweight pets or animals with diabetes.
04
Cane Molasses
Cane molasses is a viscous sweetener and palatability enhancer used in pet foods and treats to add simple carbohydrates, help bind ingredients, and contribute trace minerals like iron, calcium, potassium and magnesium along with small amounts of B vitamins. It can improve taste and texture but is high in sugars and calories, so it should be used sparingly—excessive intake can contribute to weight gain, dental issues, or unstable blood glucose in diabetic or obese pets.
05
Salmon Oil
Salmon oil is used in pet foods as a concentrated source of fat and long‑chain omega‑3 fatty acids (EPA and DHA) to support skin and coat condition, reduce inflammation, and aid joint, cardiac and cognitive health in both dogs and cats (cats particularly benefit from preformed DHA). Because it is calorie‑dense and prone to oxidation, choose stabilized, quality‑tested salmon oil from reputable sources to avoid rancidity and contaminants, and consult your veterinarian for appropriate dosing or if your pet has a fish allergy.
Nutritional Breakdown
How to read As Fed versus Dry Matter
As fed shows the numbers straight off the label, water included. Dry matter removes the water so you can compare a wet food and a dry food fairly.What is calorie density
How many calories the food packs per unit. Denser foods mean smaller portions for the same calories.Product Details & Brand
Product Specs
Brand
Under the Weather Pet is a pet food and supplement brand offering freeze-dried bland diets, broth toppers, and wellness chews for dogs and cats. The brand targets health-conscious pet owners seeking convenient, vet-formulated solutions for digestive upset and recovery support.
Visit Under the Weather PetManufacturer
All Under the Weather products are manufactured in the United States in facilities that follow FDA and USDA guidelines. The company emphasizes quality control, sourcing premium human-grade ingredients, and producing small batches to ensure safety and nutritional integrity.
Manufacturing details are compiled from public sources and not independently verified; they may not reflect contract manufacturing or co-packing.
Recall History
Under the Weather Pet Ready Cal High-Calorie Cat Supplement has no recalls since 2014.
Source: FDA Pet Food Recall Database · Monitored daily
Sign up for the full picture
Feeding Calculator
Personalized portion sizes based on your pet's weight, age, and activity level.
Get startedSimilar Foods
Post your cat's report card and challenge friends to check their food.
Frequently Asked Questions
Has Under the Weather Pet ever been recalled?
We have no recalls on record for Under the Weather Pet. We monitor the FDA Pet Food Recall Database daily.
How does KibbleLab rate foods?
Our scores are based on ingredient composition, nutritional profile, AAFCO compliance, and health considerations. We don't penalize by-products, grains, or synthetic preservatives. Brands cannot pay for higher scores.
Is KibbleLab a substitute for veterinary advice?
No. KibbleLab provides data-driven food analysis, not medical advice. Always consult your veterinarian before making dietary changes, especially for pets with health conditions.
KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.
KibbleLab may earn affiliate commissions through product links. No one can pay for a higher score, or to change what we recommend for your pet.
Product data sourced from manufacturer websites, AAFCO statements, and FDA recall database. Last verified dates reflect our most recent data check.
Continue with Google
Continue with Facebook