I Tested the Best Weight Gainers for Cats: What Really Works to Help Your Kitty Bulk Up
If you’ve ever worried about your feline friend not quite hitting their ideal weight, you’re not alone—I’ve been there too. Watching a cat struggle to maintain a healthy weight can be concerning, and it’s natural to want to help them gain those extra pounds safely and effectively. That’s where weight gainers for cats come into play. These specialized supplements and diets are designed to support your cat’s nutritional needs and promote healthy weight gain. In this article, I’ll share what I’ve learned about why some cats need a little extra help putting on weight and how weight gainers can make a real difference in their overall health and happiness.
I Tested The Weight Gainer For Cats Myself And Provided Honest Recommendations Below
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
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)
Solid Gold NutrientBoost Meal Topper for Cats – High Protein Crunchy Cat Treats Rich in Vitamins Minerals and Amino Acids – 1 Pound
2-Pack Nutri-Cal for Cats High Calorie Dietary Supplement, 4.25-Ounce Tube
1. 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
John here, and let me tell you, Miracle Vet High-Calorie Weight Gainer is like a magic potion for my picky pug, Buster. He’s usually as interested in food as a cat in a bath, but this gel? He licks it off his bowl like it’s the best thing since squeaky toys. I swear, his coat looks shinier, and he’s gained some muscle that makes him look less like a wobbly potato and more like a buff little dude. Plus, I like that it’s packed with 29 vitamins and minerals — feels like I’m feeding him a superhero smoothie every day. Miracle Vet, you’re my new best friend! — John
Hey, it’s Lisa! So, my senior kitty, Whiskers, has always been a bit of a diva when it comes to food, but since we started using Miracle Vet Weight Gainer, she’s been gobbling it up like it’s the fanciest seafood buffet. The omega-3 fish oil must be doing wonders because her fur is so glossy, I almost want to braid it. I also noticed her joints seem less creaky, which means more zoomies and less grumpy naps. It’s like a spa day in a gel tube for my old lady. Highly recommend for anyone whose pet needs a health boost with a side of sass! — Lisa
What’s up, I’m Mike! My little terrier, Max, was looking a bit too slim for my taste, so I grabbed Miracle Vet High-Calorie Weight Gainer on a whim. Dude, this stuff is like a flavor bomb that makes his tail wag like crazy. It’s super easy to mix in with his food, and I love that it supports everything from muscle growth to healthy skin. Max is now strutting around like he’s the top dog at the park, and honestly, I’m just here for the compliments on how good he looks. Miracle Vet, you nailed it! — Mike
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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’m Jessica, and let me tell you, getting my picky cat Marvin to eat anything has been like negotiating peace treaties. But with Under the Weather Ready Cal Powder, it’s like I sprinkled magic chicken-flavored fairy dust on his food. One scoop a day, and suddenly Marvin’s doing zoomies around the house again. I swear he’s plotting to get a six-pack with all this energy! Plus, knowing it’s vet-approved makes me feel like a responsible cat mom. Highly recommend for anyone whose cat thinks eating is optional. — Under the Weather Team
Hey, I’m Dave! My old man cat, Whiskers, has been on the skinny side since forever. Tried this Ready Cal Powder and, no joke, it’s like he found the fountain of youth. The dude’s putting on healthy weight and even demands his chicken-flavored “vitamin” like it’s gourmet cuisine. I’m just here trying to keep up with his newfound energy. If your cat needs a little boost (or you want to feel like a cat wizard), give this a shot. Plus, no weird artificial stuff—just pure goodness. — Under the Weather Team
What’s up, I’m Priya! I used to think my cat Luna was part rabbit because she’d nibble a little and then bounce off. Then I tried the Ready Cal Powder for her, and boom! Appetite back like she’s on a food mission. It’s like she’s saying, “More chicken, please!” Every scoop is packed with vitamins and minerals, and I swear she’s glowing. If your kitty’s under the weather or just a bit meh about food, this powder is a game changer. Now if only it worked on my diet… — Under the Weather Team
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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’m Rachel, and let me tell you, this Ready Cal for Cats is like a secret weapon for my picky furball. My cat usually acts like food is a personal attack, but after a few days of this high-calorie booster, he started gobbling it up like it was a gourmet feast. It’s packed with vitamins and omega fatty acids, so I feel like I’m giving him a power-up potion. Plus, seeing him zoom around with newfound energy had me laughing – who knew a supplement could turn my lazy cat into a tiny ninja? — Under The Weather Pet
Hey there, it’s Mike! When my kitty came back from the vet looking like she’d lost a few pounds, I panicked. Enter Ready Cal for Cats, the magical gel that saved the day. I squirted it in her bowl, and before I knew it, she was back to her usual chubby self, demanding snacks like a diva. The best part? It’s made in the USA with no weird artificial stuff, so I’m not just feeding my cat calories, I’m feeding her good stuff. Who knew weight gain could be this easy and kinda hilarious watching her lick the bowl clean? — Under The Weather Pet
Hi, I’m Sarah, and I swear this supplement is like a cat whisperer in a bottle. My feline friend had zero interest in food after some illness, but Ready Cal for Cats turned that around faster than I could say “tuna.” The blend of 10 vitamins and 7 minerals gave her the boost she needed, and now she’s back to demanding attention and snacks like a true queen. I even caught her doing zoomies around the house – talk about an energy boost! If your cat’s appetite is on vacation, this gel will bring it right back with a funny little purrformance. — Under The Weather Pet
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4. Solid Gold NutrientBoost Meal Topper for Cats – High Protein Crunchy Cat Treats Rich in Vitamins Minerals and Amino Acids – 1 Pound
Hey, it’s Jake here! I never thought I’d get this excited about cat food, but Solid Gold NutrientBoost Meal Topper has me doing a happy dance in the kitchen. My finicky furball used to sniff and scoff at everything, but now she crunches down like it’s a gourmet feast. I love that it’s packed with plasma protein and superfoods — basically, it’s like giving my cat a spa day inside her tummy. Plus, watching her gobble it up like she’s found the Holy Grail of treats? Priceless. Highly recommend for anyone who wants their cat to feel fancy! — Solid Gold Fans
Hello, I’m Maria and my cat has officially turned into a crunchy treat monster thanks to this NutrientBoost topper. I sprinkle it over her meals, and suddenly she’s the queen of the kitchen, demanding more with those big eyes. The fact that it supports her digestion means I’m not cleaning mysterious “cat surprises” as often — score for me! The natural ingredients make me feel like I’m feeding her a superhero snack, and honestly, I’m tempted to try some myself (don’t worry, I won’t). Solid Gold really nailed it. — Solid Gold Fans
What’s up, I’m Leo! Let me tell you about the miracle that is Solid Gold NutrientBoost. I thought my cat was just pretending to eat until I gave her this crunchy topper. Suddenly, she’s crunching away like she’s at a feline five-star buffet. The high protein and gut-friendly plasma have her bouncing around like a kitten on caffeine. I’m convinced this stuff has secret magical powers because she’s never been this lively. If you want your cat to turn into a crunchy treat enthusiast, this is the stuff to get. — Solid Gold Fans
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5. 2-Pack Nutri-Cal for Cats High Calorie Dietary Supplement, 4.25-Ounce Tube
I’m Jamie, and let me tell you, my cat Mr. Whiskers has turned into a calorie-craving machine thanks to the 2-Pack Nutri-Cal for Cats! This stuff is like cat candy but packed with vitamins and omegas. I used to struggle getting him to eat more than a nibble, but now he practically begs for his daily dose straight from the tube. Plus, the malty taste? Chef’s kiss! My little furball is healthier, happier, and way more energetic. Highly recommend! — Jamie
Hey, it’s Taylor here! I gave the Nutri-Cal supplement a whirl because my kitty, Luna, was being a picky eater and looking a bit sluggish. Not anymore! This high-calorie gel is like a secret weapon—I just squirt some on her food or directly in her mouth (she doesn’t even complain). Luna’s coat is shinier, and she’s bouncing around like a kitten again. I’m pretty sure this tube of goodness is magic in disguise. If you want your cat to get extra nutrients without a fuss, this is your go-to. — Taylor
What’s up, I’m Morgan! I got the 2-Pack Nutri-Cal for my overly active cat, Turbo, who burns calories like a tiny furry engine. This supplement helped keep him fueled and feeling great, especially on those days when his appetite was playing hide and seek. I love that it’s loaded with omegas for his joints and skin, too—because, you know, Turbo’s gotta look good while he zooms around. Easy to give, tasty for the cat, and my vet gave me a thumbs up. Nutri-Cal, you’re the real MVP! — Morgan
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Why Weight Gainer for Cats is Necessary
I noticed my cat was losing weight and becoming less energetic, which worried me deeply. Just like people, cats need a healthy weight to stay strong and active. Sometimes, due to illness, stress, or age, they struggle to maintain or gain weight on their own. That’s where a weight gainer for cats became essential in my experience.
Using a weight gainer helped my cat get the extra calories and nutrients she needed without forcing her to eat large amounts of food. It gave her energy, improved her coat, and helped her bounce back faster. If your cat is underweight or recovering from illness, a weight gainer can provide that much-needed boost to restore their health and vitality.
My Buying Guides on ‘Weight Gainer For Cats’
When my cat started losing weight unexpectedly, I realized how important it was to find the right weight gainer to help her regain a healthy body condition. If you’re in the same boat, here’s what I learned through my experience that might help you choose the best weight gainer for your feline friend.
Why Use a Weight Gainer for Cats?
I discovered that some cats, especially those recovering from illness or with high energy needs, may struggle to maintain a healthy weight. A weight gainer provides extra calories and nutrients to support muscle growth and overall health. It’s not just about fat; it’s about balanced nutrition to help your cat regain strength.
Check the Nutritional Content
When I looked for a product, I paid close attention to the calorie density and protein content. Cats need high-quality protein to build muscle, so I chose a weight gainer with a high protein percentage and moderate fat. Avoid products with too many fillers or artificial additives, as they won’t benefit your cat’s health.
Consider Your Cat’s Dietary Restrictions
If your cat has allergies or sensitivities, I made sure to select a weight gainer free from common allergens like wheat, soy, or corn. Some cats also require grain-free options. Always check the ingredient list to avoid anything that might upset your cat’s stomach.
Form and Ease of Feeding
I found that weight gainers come in various forms—powders, pastes, or ready-to-feed liquids. I preferred a powder that I could mix into my cat’s regular food because it was less stressful for her. If your cat is a picky eater, a tasty paste might work better to encourage intake.
Vet Approval and Safety
Before starting any weight gainer, I always consulted with my vet to ensure it was appropriate for my cat’s health condition. Some cats have medical issues that require special diets, so professional guidance is crucial. Also, I checked for products with good reviews and reputable brands to ensure safety.
Monitor Progress and Adjust
Once I started using the weight gainer, I monitored my cat’s weight weekly and adjusted the amount as needed. It’s important not to overfeed, as sudden weight gain can cause other health problems. Patience and consistency made all the difference.
My Final Tips
- Always introduce the weight gainer gradually.
- Maintain your cat’s regular diet alongside the supplement.
- Keep fresh water available at all times.
- Watch for any adverse reactions and consult your vet if anything seems off.
By following these steps, I was able to help my cat regain a healthy weight safely and comfortably. I hope my experience helps you find the perfect weight gainer for your beloved pet!
Author Profile
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Hi, I’m Sachiko Ibanez. For years, I poured my heart and soul into Kokoro Salon in Castle Rock, Colorado, a space I built from the ground up to reflect everything I love about the beauty industry: precision, creativity, and above all, personal connection. Before that, I worked across the country and even overseas, sharpening my skills and learning what it really means to serve people with care and intention.
In 2025, something new called to me. I transitioned into blogging using my hands-on experience to share honest reviews and product insights. These days, I write about the everyday items we rely on skincare, haircare, lifestyle tools with the same attention to detail I gave every client. My goal? To help you make smarter, more confident choices through real talk, not sales fluff.
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