9 Best Weight Gainers For Dogs in 2026

A 32-ounce liquid supplement that packs concentrated calories without filling up your dog’s stomach, so underweight, active, or senior dogs can get the energy they need without cutting into their regular meals. This makes it a practical choice for owners who need a straightforward way to add calories on top of a normal diet, especially for picky eaters or dogs recovering from illness. The sweet vanilla flavor helps with acceptance, and the fact that it works for puppies as young as eight weeks, pregnant and lactating dogs, and seniors means one bottle can cover multiple dogs or life stages.

The liquid form is straightforward to measure and pour, and the high fat content is part of the concentrated calorie formula designed to provide energy without limiting stomach capacity. If you prefer a powder you can stir into food, the All American Canine Dog Weight Gainer offers a beef broth and whey protein base. But for sheer convenience and versatility across all ages and conditions, this liquid supplement gets the job done with minimal fuss.

A single tub delivers 60 servings, so for a medium dog it can last a couple of months without constant reordering. The formula includes beef broth protein and whey protein for a calorie-dense boost, along with ingredients like flaxseed and pumpkin powder. It is packed with vitamins and components that support joint health and the immune system, making it a practical choice for underweight dogs that need more than just empty calories.

The trade-off is that it is a powder, so you will be mixing it into your dog’s food rather than just squeezing a gel onto the bowl. That extra step can be a minor hassle compared to a ready-to-use liquid supplement. But if your dog is okay with a little extra texture and you want a product with no artificial colors or trans fats, this powder offers a straightforward way to add calories.

With 34% crude fat and 30% crude protein per serving, this powder adds concentrated calories and protein to any meal without changing your dog’s feeding routine. It works as an appetite stimulant for dogs with reduced appetite due to age, illness, stress, or picky eating, and the sweet bacon flavor encourages reluctant eaters to finish their bowls. The 90 servings per container last about 3 months for adult dogs, making it a practical option for owners who want a high-protein, high-fat supplement to support weight gain and muscle development.

This is a powder you have to mix into wet or dry food each day, so it requires a few seconds of stirring before serving. For owners who prefer a ready-to-use gel, a product like Nutri-Cal might be more convenient, but this powder gives you control over serving size and delivers a high-protein, high-fat formula that supports lean mass and body condition.

Forty-three percent protein from whole egg means this weight gainer builds lean muscle without relying on cheap fillers like plant oils or added sugar. It’s a high-calorie topper designed for underweight, picky, or active dogs that need extra calories to reach a healthy weight. The whole-food ingredient list, whole egg, sprouted barley, organic sweet potato, and organic carrot fiber, sets it apart from competitors that lean on processed proteins or artificial additives. Probiotics and digestive enzymes help your dog absorb more from every meal, which matters when you’re trying to put weight on a sensitive stomach.

This is a powder topper, not a ready-to-use liquid or chew. You’ll need to mix it into your dog’s food, which adds a step compared to something like PetAg Dyne’s liquid supplement that you can pour straight over kibble. But if you’re after a weight gainer built from recognizable ingredients without the grease or sugar that some other products use to boost calorie counts, Rogue Pet Science delivers a cleaner option. It’s a methodical choice for owners who want to know exactly what’s going into the bowl.

With 4.25 ounces of high-calorie gel packed into each tube, this supplement delivers extra calories, essential nutrients, and omega fatty acids in a form that even finicky dogs will accept. The tasty malt flavor means you can squeeze it directly onto a paw or nose, or straight from the tube, making mealtime less of a battle for owners of picky eaters. It’s especially useful for dogs who are aging, recovering, or simply refusing food, giving you a straightforward way to boost their daily nutrition without wrestling with pills or powders.

This is a gel, not a powder, so it can get a bit sticky if your dog decides to shake their head mid-feed. But for a pet that turns up their nose at anything mixed into their bowl, the direct-feed convenience and palatable malt flavor make this a practical choice that actually gets eaten.

A dial-a-dose gel tube that packs 10 vitamins, 7 minerals, and omega fatty acids into every serving, that’s the kind of targeted nutrition you want when a dog just won’t eat. Under the Weather Ready Cal is built for those tough stretches after illness or medical procedures, when getting calories into a picky pup feels like a full-time job. The gel’s flavor is designed to tempt even reluctant eaters, and because it’s made without artificial flavors or dyes, you’re not adding junk while trying to boost their weight. For dogs that need a gentle nudge back to their bowl, this is about as straightforward as it gets.

The gel format means you squeeze the dose directly onto your dog’s tongue or food, which some dogs may not love if they’re already picky about texture. The tube weighs 0.2 pounds and has a 24-month shelf life from manufacture, so check the EXP date printed beside the barcode to use it while it’s fresh. For targeted appetite support in a convenient, no-mix format, it does exactly what it says.

With 29 essential vitamins and minerals plus omega-3 fish oil as the top ingredient, this gel packs a broad nutritional punch that goes beyond simple calorie loading. It’s designed to support overall health, coat, joints, heart, and energy, while helping underweight dogs gain weight. That makes it a strong fit for picky eaters, seniors, or pregnant pets who need more than just extra calories.

You’re committing to a gel you’ll need to give daily. If you’d rather avoid fish oil or prefer a powder format, something like All American Canine Dog Weight Gainer Powder might suit you better. But for a multivitamin-rich weight gainer that also stimulates appetite, this is a well-rounded choice.

The soft, bacon-flavored texture makes them easy to give as a daily treat, and the 250 million CFUs of probiotics per bag support digestion while the weight goes on. This is a straightforward option for owners who want a convenient, no-mix supplement that dogs actually look forward to eating.

These are soft chews, so if your dog is picky about texture or prefers crunchy biscuits, you might have to get creative. For a dog that takes soft treats readily, this is about as hassle-free as weight gain gets.

A 5 oz tube of high-calorie gel packs concentrated vitamins, minerals, electrolytes, and Omega 3-6-9 fatty acids to support dogs during recovery, stress, or low energy. That makes it a practical pick if your dog is coming off an illness, dealing with appetite issues, or just needs a calorie boost without fighting over food. The malt flavor goes down easy, squeeze it straight into their mouth or stir it into a meal, and you’re done. It’s especially handy for aging pets or those with increased physical demands, since the formula targets muscle development and daily vitality.

Gel can be stickier than a powder you’d mix into kibble, and if your dog is really refusing food, the recommended dosage doubles, meaning you’ll go through the tube faster than expected. Compared to a powder like All American Canine Dog Weight Gainer, which you’d scoop into a bowl, this gel is more about immediate, targeted support than long-term bulk feeding. For a dog that needs a quick nutritional lift during recovery, Vetri-CAL does the job without fuss.