4 Best Weight Gain Powders for Dogs in 2026

Which weight gainer should you choose?

If you want the best weight gain powder for dogs that is packed with nutrients and great for picky eaters, go with Rogue Pet Science Healthy Weight.

If your dog won’t touch a powder mixed into his food, try Tomlyn Nutri-Cal. It is a high-calorie gel with added vitamins and omega fatty acids that you can feed straight from the tube.

If you’re looking for an all-natural option focused on muscle, MYOS Canine Muscle Formula is a great choice. Its main ingredient is fertilized egg yolk, and it’s especially useful for dogs with limited mobility.

Finally, if you want a weight gain powder that your dog is sure to love, go with PET CARE Weight Gainer. It comes in a sweet bacon flavor, is packed with proteins and amino acids, and is easy to add to your dog’s daily routine.

Additional tips for weight gain for your dog

If your dog is underweight, you might be asking how to encourage them to acquire a healthy weight. First, book a vet check if your dog has lost weight without an obvious reason, or if the weight loss comes with vomiting, diarrhea, a change in appetite or thirst, or low energy. Parasites, dental pain, diabetes, kidney or thyroid problems, and other illnesses can all cause weight loss, and no powder will fix those.

Once your vet has given the all-clear, you can also do the following alongside a weight gain powder to help your dog bulk up:

1Add olive oil to their diet

For example, you can add some olive oil or fish oil to their diet. These healthy fats will help to increase their calorie intake without adding too many unhealthy ingredients. Start with a small amount and increase slowly, though, as too much fat at once can cause diarrhea and, in some dogs, pancreatitis. We share more ideas in our guide to homemade weight gainers for dogs.

2Exercise

Another thing you can do is to make sure your dog is getting enough exercise. Exercise helps to build muscle mass, which can help your dog bulk up. Just be sure not to overdo it, as too much exercise can actually cause weight loss.

3Feed them multiple times a day

Finally, you can try feeding your dog three or four smaller meals a day instead of one or two. This makes it easier for them to eat more calories in total without upsetting their stomach. Our dog calorie calculator can give you a daily calorie target to work toward based on your dog’s weight and body condition.

Final thoughts

Overall, weight gain powders are a handy way to help your dog bulk up. However, they should be used in conjunction with other methods like exercise and a healthy, complete diet. Aim for slow, steady weight gain, weigh your dog every week or two, and check in with your vet if the scale doesn’t move after a few weeks.