Top 10 Best weight gain for dogs in 2026

Last Updated - 6/19/2026

🏆Best Choice

Under the Weather

Under the Weather Pet | Ready Cal for Dogs 100cc | High Calorie Supplement | Weight Gainer and High Calorie Booster | 10 Vitamins, 7 Minerals & Omega Fatty Acids

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Helps Dog Gain Weight: Filled with healthy ingredients to help your dog gain weight if they aren't eating properly. Shelf life: 24 months from manufacturing date. EXP date printed beside the barcode as EXP MM/YY.
•Stimulates Appetite: When your dog isn't getting proper nutrition due to reasons such as illness or medical procedures, this nutritional supplement gel will help restore your pup's appetite to keep them healthy and strong
•Energy Booster: Vitamins, minerals, carbohydrates, and omega fatty acids are essential nutrients to boost your dog's weight, appetite and energy.
•Easy to Use: This gel supplement for your dog comes in a convenient dial-a-dose tube to ensure that you’re able to give your pup the proper dosage it requires.
•The Best For Your Dog: Ready Cal for Dogs is veterinary formulated with tasty flavor dogs love to promote weight gain. Proudly manufactured in the USA without artificial flavors or dyes.

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$23.99

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Miracle Vet

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

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•HIGH-CALORIE WEIGHT GAINER for DOGS and CATS - Miracle Vet dog high-calorie weight gain multivitamin supplement is packed with calories and essential vitamins, and minerals to support overall pet health and formulated especially for multiple purposes, including senior dog supplements, dog prenatal vitamins, and dog electrolytes
•29 VITAMINS & MINERALS - This cat and dog multivitamin is packed with 29 essential vitamins and minerals, including calcium for dogs and fish oil for cats, designed to support your pet's overall health and well-being. Ideal as senior dog vitamins, and dog food supplements, this versatile formula also works as a dog muscle builder and dog food topper for picky eaters ensuring your furry friend gets all the nutrients they need to thrive
•#1 INGREDIENT IS OMEGA-3 FISH OIL - Miracle Vet Weight Gain supplement comes packed with omega-3 fish oil, which promotes healthy skin and coat while providing a natural energy source. Ideal for cat, dog moms and pet care enthusiasts, this dog and cat supplement support the overall health of your furry family members. Additional fish oil health benefits: protects the heart, provides support for dry, flaky skin in allergy, helps slow down the progression of kidney disease, aids arthritic joints
•EASY TO USE NUTRITIONAL SUPPLEMENT - Our weight gainer for dog and cat multivitamin is simple to incorporate into your pet's daily routine, whether mixed with their regular dog food, used as a dog food topper for picky eaters, or added to water. Ideal for small breed dogs, senior dogs, and puppies, this dog and cat nutritional supplement is perfect for pet owners looking to improve their pet's health, muscle growth, and weight gain. Give your furry friend the care they deserve with Miracle Vet
•APPETITE STIMULANT for PETS - Supportive appetite stimulant for dogs and cats will entice even the most finicky eaters, ensuring they get the vitamins and nutrients they need to thrive, including dog electrolytes and calcium for dogs and cats. It caters to various pet needs, making it ideal for cat and dog care. From weight gain and appetite stimulation to senior dog care and prenatal support, this all-in-one formula is perfect for pet parents who want the best for their furry companions
•VET-REVIEWED - Our veterinarian reviewed recipe weight gainer and multivitamin has been designed to be suitable for pets of all ages and sizes. Safe for your pet, no matter their age or breed. Miracle Vet pet supplements are approved by Dr. Christine Priest DVM. CA, USA. Reviewed for quality, safety, effectiveness. Made in the USA and using all natural, vet-approved ingredients with added vitamins and minerals
•NATURAL and HEALTHY - Natural with Added Vitamins and Minerals. Safe and healthy. Free of polypropylene (safe for cats), glycerine, artificial colors, trans fats

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$25.99

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PetAg

PetAg Dyne High Calorie Liquid Nutritional Supplement for Dogs & Puppies 8 Weeks and Older - 16 oz - Supports Performance and Endurance - Sweet Vanilla Flavor

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•HIGH-CALORIE SUPPLEMENT FOR DOGS & PUPPIES 8 WEEKS AND OLDER - Dyne is a powerful nutritional supplement that provides additional calories to support dogs in all life stages: active, pregnant, lactating, underweight and senior.
•POWERFUL NUTRITION - This High-calorie, low-volume formula supports performance and endurance for working and active dogs; and provides pregnant/lactating dogs with important nutrients.
•DENSE FORM OF ENERGY - The Concentrated Calories in Dyne don’t limit stomach capacity for a dog’s normal diet.
•DIRECTIONS - Shake well prior to feeding. Can be fed directly or poured over food. With high fat and a sweet Vanilla flavor, Dyne is highly palatable.
•ABOUT US - PetAg is a Trusted leader in pet wellness, with science-backed formulas in our milk replacers, health supplements, and grooming products helping pet owners to proactively enhance the lives of their pets, for more healthy years together.

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$16.99

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PetAg

PetAg Dyne High Calorie Liquid Nutritional Supplement for Dogs & Puppies 8 Weeks and Older - 16 oz - Supports Performance and Endurance - Sweet Vanilla Flavor

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•HIGH-CALORIE SUPPLEMENT FOR DOGS & PUPPIES 8 WEEKS AND OLDER - Dyne is a powerful nutritional supplement that provides additional calories to support dogs in all life stages: active, pregnant, lactating, underweight, and senior.
•POWERFUL NUTRITION - This high-calorie, low-volume formula supports performance and endurance for working and active dogs; and provides pregnant/lactating dogs with important nutrients.
•DENSE FORM OF ENERGY - The concentrated calories in Dyne don’t limit stomach capacity for a dog’s normal diet.
•DIRECTIONS - Shake well prior to feeding. Can be fed directly or poured over food. With high fat and a sweet vanilla flavor, Dyne is highly palatable.
•ABOUT US - PetAg is a trusted leader in pet wellness, with science-backed formulas in our milk replacers, health supplements, and grooming products helping pet owners to proactively enhance the lives of their pets, for more healthy years together.

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$17.72

$20.39

-13%

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Bully Max

Bully Max Dog Weight Gainer Soft Chews for Puppies and Adults - High Calorie Dog Food Performance Supplements for Healthy Weight Gain, Immunity & Digestive Health - 75 Chews for All Breeds & Ages

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•EFFECTIVE SOLUTION FOR HEALTHY WEIGHT GAIN: Bully Max Weight Gainer Dog Chews provide a natural and effective way to support healthy weight gain in dogs. Each bag delivers 1,500 calories, ensuring your pitbull, bulldog, or any breed gets the essential nutrition for optimal health and vitality. These high-calorie supplements are ideal for underweight dogs, including growing puppies and senior dogs, helping them build muscle and maintain energy levels.
•PROBIOTICS FOR DIGESTIVE & IMMUNE SUPPORT: Packed with 250 million CFUs of probiotics per bag, Bully Max Weight Gain Dog Chews promote better digestion and strengthen the immune system. Suitable for all dog life stages, these nutrient-packed chews provide comprehensive support for your pet's health. This dog weight gain supplement is ideal for all life stages, from young puppies to adult dogs, enhancing their overall health and wellbeing.
•VERSATILE AS A TASTY DOG FOOD TOPPER OR TREAT: Bully Max Weight Gainer Power Chews provide a convenient and delicious way to support weight gain and energy. Ideal for dogs of all ages and breeds, these bacon-flavored chews can be given as a treat or easily crushed and used as a food topper. Perfect for walks, hikes, or play sessions, they’re packed with high calories, making them an excellent supplement for dogs needing an extra boost of energy and nutrition.
•PURE & WHOLESOME INGREDIENTS: Bully Max Power Chews, made with high-quality natural ingredients and enriched with essential vitamins, minerals, and nutrients, are ideal for dog and puppy weight gain. These dog chews for gaining weight are free from added sugar, gluten, wheat, artificial flavors, animal by-products, glycol, and glycerine, ensuring a natural, balanced diet. These chews support healthy weight gain without harmful additives, providing nutrition and delicious taste in every bite.
•PREMIUM QUALITY & VET-APPROVED EXCELLENCE: Made in the USA with globally sourced ingredients, our Bully Max Dog Chews meet the highest quality standards. Every product from Bully Max undergoes rigorous vet approval, backed by our commitment to zero recalls. Bully Max is dedicated to high-quality pet care, providing vet-approved, high performance wet dog food and dry dog foods, along with premium puppy & dog supplements, to guarantee top-quality canine nutrition for puppies and senior dogs.

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$26.99

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All American Canine

All American Canine Dog Weight Gainer – High Calorie Dog Food Supplement & Protein Powder for Rapid Weight Gain, Mass, and Recovery – Appetite Stimulant – 60 Servings

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•HELPS DOG GAIN WEIGHT: All American Canine powder helps dogs to gain healthy weight fast. Our powder is a high-calorie weight gainer and is packed with vitamins, probiotics, and other digestive, joint, and muscle-supporting components that help your pets regain energy and vitality.
•HEALTHY WEIGHT SUPPLEMENT: Our premium weight gainer is formulated with a unique blend of high-quality ingredients working to promote joint health, enhance muscle growth, boost the immune system, and support a dog’s overall well-being.
•USEFUL INGREDIENTS: Beef broth protein powder, whey protein, ground flaxseed, beef, liver powder, sweet potato powder, pumpkin powder, blueberry powder, sunflower lecithin, organic kelp, and essential nutrients to boost your dog's weight to stay active and play more.
•ADD WEIGHT & ENERGY TO YOUR PET FAST: Our high protein and fats powered are packed with essential vitamins and minerals to help your dog gain healthy weight and increase energy levels. They are easy to feed and taste great so your pet will love them.
•NONE OF THE BAD STUFF: We're dog lovers. That is why we only use all-natural, safe, and nutritious components. There is no polypropylene (which is safe for cats), glycerin, artificial colors, or trans fats.
•Made in USA. Manufactured in United States of America.

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$37.98

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OKKÖBI

11-in-1 Muscle Gain Chews - Weight Gain Supplements for Dogs with High Protein & Amino Acids - Premium Muscle Builder for Bully & All Breeds - Healthy for Puppies - 150 Chews - Chicken

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•💪11-IN-1 CHEWS TO BOOST MUSCLE & STRENGTH: Packed with premium protein and essential amino acids like L-Arginine, L-Glutamine, L-Leucine, L-Isoleucine, and L-Valine to support healthy muscle growth and repair for a stronger, more athletic dog.
•📈HEALTHY WEIGHT GAIN FORMULA: Calorie-dense chews provide the extra nutrition needed for lean mass and healthy weight gain, loaded with a bunch of natural and organic ingredients such as Tumeric root powder, Ashwagandha and Wild Alaskan Salmon oil. They are perfect for underweight or active dogs.
•🐾SUSTAINED ENERGY & VITALITY: Formulated with Astaxanthin, Vitamin C and Glucosamine HCL to provide long-lasting energy, these delicious chews help fuel your dog's daily activities and promote overall vitality.
•🐕‍🦺VET-APPROVED & ALL-BREED FRIENDLY: Designed with veterinarian input and suitable for puppies, adult dogs, and all breeds to help them thrive.
•🐶IRRESISTIBLY TASTY TREAT: Your dog will love the delicious flavor, making these chews an easy and enjoyable way to supplement their diet for optimal health and gains!

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$12.97

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PET CARE Sciences

Dog Weight Gainer Approx 90 Servings - Weight Gain Supplements for Dogs - Canine and Dog Muscle Builder - Made in The USA

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•DOG WEIGHT AND MUSCLE GAIN - Has your dog recently suffered from an illness or injury which has caused them to lose weight or size? Or do you have a show or working dog which could benefit from some extra size or muscle growth? PET CARE Sciences dog weight gainer is the product for you!
•WEIGHT GAINER FOR DOGS - Packed with protein and all the other natural supplements that your dog needs to regain lost weight or increase muscle size. Simply add this daily weight gain supplement into your dogs daily routine to help your dog bulk up. Each serving contains roughly 600 calories.
•OTHER KEY BENEFITS - Not only will this supplement help to grow your dogs size it also aids with the side affects of the increase weight. Included vitamins such as amino acid help with joints strain, reduce inflammation and supports your dogs skin and coat condition.
•HOW TO USE - Containing roughly 90 servings of sweet bacon flavor powder, you will not struggle to get your dog to take this supplement. Other size options include 30, 45, 90, 230 and 415 packs. Simply add to their food daily to see the best results. We recommend half a scoop daily for a puppy and one full scoop daily for adult dogs. (see product packaging for full portion suggestion)
•PET CARE Sciences - We know that your pet's health and happiness is incredibly important to you, and rightly so. PET CARE Sciences is here to help safely maintain the health of your precious pets. Made in the USA from naturally sourced ingredients to best support mans best friend.

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$35.47

$39.47

-10%

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All American Canine

All American Canine Dog Weight Gainer Liquid – High Calorie Dog Food Supplement for Rapid Weight Gain, Mass, and Recovery – Appetite Stimulant – 60 Servings

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•HIGH CALORIE WEIGHT GAINER FOR DOGS – All-natural liquid dog weight gainer designed to support healthy weight gain, mass, and recovery for dogs of all breeds and ages. Perfect high calorie supplement for dogs that need extra calories.
•ALL-NATURAL INGREDIENTS & PURE OILS – Made with salmon oil, coconut/MCT oil, avocado oil, flaxseed oil, and olive oil. This dog weight gain supplement contains no fillers, harmful chemicals, or artificial flavoring.
•SUPPORTS COAT, JOINT & MUSCLE HEALTH – Rich in essential omega fatty acids and nutrients, this dog supplement helps maintain joint health, muscle development, and a shiny coat while providing calorie-dense nutrition.
•TASTES LIKE A TREAT, WORKS LIKE A SUPPLEMENT – Flavor-packed liquid dog food enhancer with a savory taste dogs love, making it easy to mix with meals. Ideal as a dog food additive and liquid dog food calorie booster.
•PROUDLY MADE IN THE USA – Premium quality high calorie dog supplement manufactured with natural ingredients to provide safe and effective weight gain for dogs. Convenient serving sizes tailored for small to large breeds.

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$29.98

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Miracle Vet

Miracle Vet Dog Weight Gainer Chews for Energy & Mass - High Calorie Dog Food Supplement - Appetite Stimulant & Healthy Weight Gain Supplements for Dogs - 60 Soft Dog Treats for Puppies and Adults

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Helps dogs gain weight and adds extra energy - 1,500 calories. Our high-calorie weight gain supplement is perfect for adult dogs and puppies of all breeds and sizes. Whether you have a senior dog needing a boost in energy, or a puppy requiring extra nutrients for growth, our dog supplement is the ideal solution. Improve your pet's overall health and well-being with this natural, effective dog weight gain treat
•Appetite stimulant for picky eaters - Our supplement supports digestion and ensure your dog gets the necessary nutrients for weight gain and overall health. The supplement supports metabolism and encourages your pet to eat more and get more out of its nutrition.
•Probiotics for gut health - 250 million CFUs are beneficial bacteria that support your dog's digestive system, enhancing nutrient absorption and overall gut health, reduced bloating, and firmer stools. A healthy gut can boost your dog’s immune system, helping them fight off infections and allergies more effectively.
•Supports during pregnancy, recovery from illness & injury - Miracle Vet dog weight gain and recovery supplement provides essential nutrients to support prenatal health or aid in recovery from illness and injury. The included probiotics help support digestion, ensuring your pet gets the most out of every meal.
•For dogs of all ages - High Calorie Formula for senior dogs needing weight gain, recover or maintain weight and puppies requiring extra energy, this supplement supports overall health and recovery for all ages.

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$26.49

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