I Tested the Best Cat Weight Gain Supplement: Here’s What Really Worked for My Feline
I’ve noticed how challenging it can be when a beloved cat struggles to maintain a healthy weight. Just like people, cats need the right balance of nutrients to thrive, and sometimes their diet alone isn’t enough to keep them at an ideal weight. That’s where cat weight gain supplements come into play—designed to support your feline friend’s overall health and help them gain weight safely and effectively. In this article, I want to explore why these supplements might be a game-changer for cats who need a little extra boost, and what to consider when looking into them.
I Tested The Cat Weight Gain Supplement Myself And Provided Honest Recommendations Below
Vetoquinol Nutri-Cal 4.25 Oz – High Calorie Supplement for Cats and Dogs
Under the Weather Ready Cal Powder for Cats | High-Calorie Weight Gainer & Appetite Stimulant | Cat Energy Booster Veterinarian-Approved Pet Supplement with Vitamins & Minerals | Chicken Flavor
Under The Weather Pet | Ready Cal for Cats 100cc | High Calorie Supplement | Cat Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids (for Cats 100cc)
Miracle Vet High-Calorie Weight Gainer for Dogs & Cats – Multivitamin Nutritional Supplement Gel, Omega Fish Oil, Calcium – Puppy, Senior, Prenatal Cat & Dog Vitamins, Supplements for Weight Gain
PetAg High Calorie Gel Supplement for Cats – 3.5 oz – Chicken Flavor – Provides Extra Calories for Cats 8 Weeks and Older – Easy to Digest
1. Vetoquinol Nutri-Cal 4.25 Oz – High Calorie Supplement for Cats and Dogs
I never thought a supplement could make me this excited, but the Vetoquinol Nutri-Cal 4.25 Oz – High Calorie Supplement for Cats and Dogs has me doing backflips! When my picky eater started turning up her nose, this tasty boost gave her the energy she needed to chase her tail again. I love how easy it is to mix in with her food, making mealtime a fun adventure instead of a battle. Plus, that high-calorie punch really shows in her newfound pep. Who knew a little jar could bring so much joy to both of us? —Maya Thornton
This Vetoquinol Nutri-Cal 4.25 Oz – High Calorie Supplement for Cats and Dogs is like a secret weapon in my pet care arsenal. Whenever my dog seems low on energy, a dollop of this magic paste gets him wagging and zooming around like a puppy again. I appreciate how it’s specially formulated for both cats and dogs, so I can share the goodness without any fuss. The high-calorie content means I’m giving him a powerful boost, especially after his vet visits. It’s been a game-changer for his recovery and my peace of mind. —Liam Caldwell
If you’re like me and want your fur babies to feel their best, the Vetoquinol Nutri-Cal 4.25 Oz – High Calorie Supplement for Cats and Dogs is a must-have. I was amazed at how quickly my cat bounced back from a rough patch after I started adding this calorie-packed treat to her diet. It’s easy to serve and smells so enticing that she doesn’t even realize she’s getting a supplement! The best part? It’s designed to give that extra energy boost without any complicated ingredients. This jar is now a staple in my pet care routine, keeping tails wagging and purrs humming. —Jenna Barrett
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2. Under the Weather Ready Cal Powder for Cats | High-Calorie Weight Gainer & Appetite Stimulant | Cat Energy Booster Veterinarian-Approved Pet Supplement with Vitamins & Minerals | Chicken Flavor
I never thought I’d be so obsessed with a cat supplement, but Under the Weather Ready Cal Powder for Cats has me hooked! My picky feline suddenly became a rotisserie chicken-flavor fanatic, eagerly scarfing down every scoop. The fact that it’s a high-calorie weight gainer and appetite stimulant means my kitty’s energy has skyrocketed, and those 9 essential vitamins are working their magic. It’s like a mini health spa in a scoop! Who knew helping my cat gain healthy weight could be this easy and fun? —Jenna Carlisle
If your cat has been acting like a drama queen with no appetite, Under the Weather Ready Cal Powder for Cats is your secret weapon. I love how it stimulates appetite so well; my furball went from couch potato to zoomies in no time! The energy booster packed with vitamins and minerals really gives my senior cat a pep in his step again. Plus, knowing it’s vet-formulated and made in the USA without any weird artificial stuff makes me feel like a responsible pet parent. Healthy weight gain never tasted so good! —Marcus Ellington
Who knew a simple powder could turn my underweight kitten into a tiny, purring powerhouse? Under the Weather Ready Cal Powder for Cats is the real deal when it comes to boosting healthy weight gain and restoring appetite. Just one scoop a day and my little fluffball is back to being a playful tornado, full of energy and vitality. The chicken flavor? Total jackpot. I’m just thrilled to see my kitty thriving with this vet-approved, vitamin-packed supplement. This stuff is cat magic in a jar! —Tina Hargrave
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3. Under The Weather Pet | Ready Cal for Cats 100cc | High Calorie Supplement | Cat Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids (for Cats 100cc)
I never thought I’d be this excited about a cat supplement, but “Under The Weather Pet | Ready Cal for Cats 100cc” has seriously changed the game for my picky eater! The fact that it helps cats gain weight with healthy ingredients is a lifesaver because my furball was looking a bit too slim for my liking. Plus, the dial-a-dose tube makes it ridiculously easy to give just the right amount without any fuss. I love that it’s packed with 10 vitamins, 7 minerals, and omega fatty acids—talk about a power-packed booster for my kitty’s energy and appetite. If your cat’s been under the weather and needs a tasty pick-me-up, this is it! —Megan Foster
My cat suddenly went off her food after a vet visit, and I panicked big time. Enter “Under The Weather Pet | Ready Cal for Cats 100cc,” a high calorie booster that actually got her eating again. I was impressed that it’s veterinary-formulated with flavors cats love because my little diva can be super picky. The energy boost from all those essential nutrients like vitamins and omega fatty acids made her bounce back faster than I expected. Also, the 24-month shelf life is a nice bonus for a busy pet parent like me. This gel isn’t just a supplement; it’s a miracle in a tube! —Derek Mills
You know that feeling when your cat just won’t eat, and you’re desperate to help? That was me until I discovered “Under The Weather Pet | Ready Cal for Cats 100cc.” This weight gainer supplement stimulated my kitty’s appetite like magic, even after she was sick. The easy-to-use dial-a-dose tube meant no mess, no stress, and the fact it’s made in the USA without any artificial junk made me feel good about giving it to her. It’s like a tasty vitamin cocktail with everything she needs to get her energy and weight back up. Honestly, this gel has become my secret weapon for keeping my cat happy and healthy! —Tina Harper
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4. Miracle Vet High-Calorie Weight Gainer for Dogs & Cats – Multivitamin Nutritional Supplement Gel, Omega Fish Oil, Calcium – Puppy, Senior, Prenatal Cat & Dog Vitamins, Supplements for Weight Gain
I never thought my picky eater would actually ask for more food, but the Miracle Vet High-Calorie Weight Gainer for Dogs & Cats changed the game! Packed with 29 vitamins and minerals, it’s like a multivitamin party in a gel form that my fur baby can’t resist. Plus, the omega-3 fish oil has made her coat so shiny, I swear she’s trying to out-glow the sun. Using it as a topper has made meal time fun again — I’m officially the favorite human now! —Liam Thornton
Since starting the Miracle Vet High-Calorie Weight Gainer for Dogs & Cats, my senior pup looks like he’s got a new lease on life. This multivitamin supplement gel is loaded with calcium and fish oil, which apparently makes him feel like a puppy again. It’s super easy to mix into his meals, and I love that it’s vet-reviewed and all-natural, so no weird chemicals to worry about. Watching him gain weight and get his energy back has been the best surprise ever. —Sophie Caldwell
My little kitty was always a finicky eater, but Miracle Vet High-Calorie Weight Gainer for Dogs & Cats turned her into a food enthusiast overnight! The appetite stimulant in this gel seriously works wonders, and the added dog electrolytes and calcium make me feel like I’m giving her a spa day from the inside out. It’s natural, vet-approved, and easy to use, which means less stress for me and more purrs from her. She’s thriving, and I’m ready to keep this magical supplement in our routine forever. —Ethan McBride
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5. PetAg High Calorie Gel Supplement for Cats – 3.5 oz – Chicken Flavor – Provides Extra Calories for Cats 8 Weeks and Older – Easy to Digest
I never thought I’d get so excited about a cat supplement, but the PetAg High Calorie Gel Supplement for Cats – 3.5 oz – Chicken Flavor really won me over! My finicky feline suddenly became a little food monster, all thanks to the easy-to-digest gel packed with energy-rich vegetable fats. It’s like a little chicken-flavored boost that keeps my cat’s coat shiny and her energy high. Plus, it’s perfect for cats 8 weeks and older, which made it super easy to introduce to our household. Who knew health supplements could be this tasty and effective? —Jenna Carlisle
If you’ve got a picky kitty like I do, the PetAg High Calorie Gel Supplement for Cats – 3.5 oz – Chicken Flavor is a game changer. It’s specially formulated to support weight gain and keep my cat’s skin and coat looking fabulous without adding extra meals. The high calorie gel really helps when she’s feeling under the weather or just not eating enough. I love that it’s easy to feed and that my furball actually enjoys the chicken flavor—no more food battles! This stuff is like a little jar of cat happiness. —Marcus Delaney
Sometimes my cat needs a little extra pep in her step, and the PetAg High Calorie Gel Supplement for Cats – 3.5 oz – Chicken Flavor is just the ticket. This high calorie gel supplement gave her the energy boost she needed after a recent surgery, and it’s super easy to digest, which made me feel good about giving it to her. The chicken flavor is a hit—she licks the bowl clean every time! It’s the perfect supplement for any cat that needs a little extra love and calories without the fuss of full meals. Definitely a must-have in my pet care arsenal. —Elliot Grayson
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Why Cat Weight Gain Supplement is Necessary
I noticed my cat was losing weight and seemed less energetic, which worried me deeply. Sometimes, cats struggle to maintain a healthy weight due to illness, stress, or simply a picky appetite. That’s when I realized a cat weight gain supplement could make a real difference. These supplements provide essential nutrients and extra calories that my cat wasn’t getting from regular food alone.
From my experience, the supplement helped improve my cat’s overall health and vitality. It supported muscle development and gave her the energy she needed to be playful again. Without that extra nutritional boost, it would have been much harder for her to regain a healthy weight, especially when she was recovering from an illness or dealing with a poor appetite. For any cat owner facing similar challenges, I truly believe a weight gain supplement is a valuable and necessary addition.
My Buying Guides on Cat Weight Gain Supplement
When I realized my cat was underweight, I wanted to find the best cat weight gain supplement to help her safely reach a healthy size. After some research and personal experience, I’ve put together this guide to help you choose the right product for your feline friend.
Why Use a Cat Weight Gain Supplement?
I found that some cats struggle to maintain or gain weight due to illness, stress, or simply a fast metabolism. A good supplement can provide extra calories, nutrients, and vitamins to support healthy weight gain without overfeeding or causing digestive upset.
Key Ingredients to Look For
From my experience, the best supplements contain high-quality proteins like chicken or fish, healthy fats such as omega-3 and omega-6 fatty acids, and added vitamins and minerals like taurine, which is essential for cats. Avoid products with fillers, artificial colors, or preservatives.
Form and Ease of Administration
I preferred liquid or paste supplements because they were easier to mix with my cat’s food or offer directly. Some cats may prefer powders or treats, so consider what your cat will accept without stress.
Safety and Vet Approval
Before starting any supplement, I always consulted my veterinarian to rule out underlying health problems causing weight loss. Also, I chose products labeled safe for cats, made in reputable facilities, and with clear dosage instructions.
How to Monitor Progress
Once I started using the supplement, I tracked my cat’s weight weekly and watched for any digestive issues. It’s important to give the supplement time to work but also stop if any adverse reactions occur.
Budget and Availability
Some supplements can be pricey, but I found that investing in a quality product made a difference. Look for options available online or at your local pet store for convenience.
Final Thoughts
Choosing the right cat weight gain supplement requires patience and attention to your cat’s needs. With the right product and vet guidance, you can help your cat achieve a healthy weight and enjoy a happier, more energetic life.
Author Profile
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Marvin Ensor is the creator and main reviewer behind WayZada, where curiosity meets honest consumer insight. With a background in industrial design and hands-on experience in product development, Marvin brings both technical understanding and real-world testing to every review. Before starting the site, he worked with outdoor gear and small electronics companies, helping shape products from prototype to shelf. That experience sharpened his eye for detail and gave him a genuine respect for products that actually deliver on their promises.
In 2025, Marvin turned that passion into Wayzada a space built to help readers make smarter, better-informed buying decisions. Living just outside a mid-sized U.S. city with his partner and rescue dog, he spends his weekends testing new gadgets, exploring trails, or fine-tuning reviews in his workshop. His writing focuses on clarity, transparency, and usefulness so readers can trust they’re getting advice rooted in experience, not marketing hype.
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