How to Fatten Up A Dog

Food & Nutrition | Lifestyle | Dog

When you search weight management for dogs, all you get is information about helping your dog lose weight, get in shape, or stay active. But what if that’s not the issue? What if you need to know how to fatten up a dog instead?

If your dog is underweight due to illness, growth, or even poor diet, you’ll need to help her bulk up safely. You could just feed her more, but that doesn’t necessarily translate to a healthier dog.

I know I said fatten up your dog, but our real goal is to build and maintain muscle. Appropriate muscle and energy can help improve mobility, joint function, and your dog's overall health, especially as she ages.

Talk to your vet about your dog’s weight before you get started. Sudden weight loss or unexplained weight fluctuations could be a symptom of another issue. Make sure your dog is healthy before you try to bulk her back up.

Take Baby Steps

There are several ways to help your dog gain weight, but you need to be sure that she isn't putting on the wrong kind of weight or putting on weight too fast. A sudden or drastic weight gain can damage their joints as the pressure of their extra weight increases.

As you begin, make sure you set small goals for your dog. It could be a small as half a pound at a time. Feel their ribs, hips, and look at them from above and from a profile. Even if their weight hasn't changed much, you can still see progress in their bodies definition. 

Use this body conditioning score chart to see if your dog is starting to look healthier. 

How to Fatten Up A Dog

As your pet gains weight and builds muscle, their ribs and hips shouldn't feel as pronounced, and there should be more bulk around the hips, shoulders and chest. This indicates healthy muscle development.  

You are also looking at her energy levels. Healthy muscle and the appropriate calories will give your dog consistent energy to participate in her daily routines and activities. 

How to Fatten Up Your Dog

To bulk up your dog, you need to increase your dog's calorie intake, but that’s only one side of the coin. As you increase calories, you must ensure that they are calories that she will actually use.

Pumping her full of calories that she isn’t using will lead to weight gain, but not muscle development. Instead, you need to have an appropriate balance of high-quality calories and activity to ensure that her body is using those calories to build muscle and provide energy to her body.

Food Toppers

 weight gain for dogs

Helping your dog bulk up will require calories from high-quality proteins and fats. You don’t necessarily need to change your dog’s whole diet, especially if you are already feeding a meat-rich, premium diet. Instead, you can add to their current diet to help them reach their goal weight.

Here are some tasty toppers that will make your dog’s diet more calorie dense:

Avoid adding large portions of fat to your pet’s diet. If you are increasing fat and protein, do it in small quantities. Excess fat can add stress to the pancreas and cause digestive issues. Small portions can help them to get used to the increase in both volume and nutrients and prevent unpleasant reactions to the diet changes.

Calorie Boosters

how to make a dog gain weight

Calorie dense foods also increase the quantity of food your dog must eat. Your dog may not agree, but her stomach can only hold so much, and the additional calories they require may be more than they can fit.

Fortunately, there are supplements that can boost calories, protein, and fat that won’t take up valuable stomach space or cut into their regular diet.

Check out some of our favourite picks:

Human Food

weight gain for dogs

Another way to increase your dog’s calories is to offer them some of your food. I’m sure your dog will jump for joy at that thought. Not all human foods are safe to offer your dog, and not all of them will help you meet your dog’s weight goals.

Here are some of the best human foods to help your dog bulk up:

  • Eggs - Raw, scrambled, over easy. Just make sure they are plain.
  • Cottage Cheese - Full fat.
  • Lean meat - Raw or cooked to match their diet.
  • Quinoa – It provide usable energy and is one of the only carbs that contains a full spectrum of essential amino acids needed for muscle building.

How to Increase Calories Safely

Adding calories to your dog’s diet should be done gradually. You can’t just double her portions and hope for the best. Instead, you need to slowly increase portions over time.

Here’s a basic example of how you can start putting weight on your dog safely.

 weight gain for dogs

Tracking changes to your dog's meals and recording weekly weight check-ins can help you to learn what works and what doesn't.

The values in this chart aren’t going to be right for every dog. Smaller dogs will need smaller changes, and a larger dog may be able to handle more drastic increases. Stick to around 10-15% increases at a time.

As you increase calories, you need to increase activity too. An extra 5 minutes on your walk, a few more ball tosses in the backyard, or even some extra mental exercise like puzzles and indoor games can be helpful.

Check out Bored Dog: Symptoms & Solutions for Dog Boredom for tons of great ideas to encourage mental activity. 

Make sure you talk to your vet about your dog’s ideal weight. You want to avoid going over your dog’s target weight and making them chunky. If your dog needs to put on a significant amount of weight, then it’s best to talk to your vet about the safest ways to make more drastic changes to their diet and routine.

Do you have an underweight dog? Let us know how you are helping your dog reach their goal weight. Share your stories, successes, and tips in the comments below!

Natural Dog Food


Posted by Krystn Janisse

Krystn Janisse

Krystn is a passionate pet nutrition enthusiast. She has worked in the pet industry for over a decade and loves to share her passion for animal welfare with others. She loves all animals but is currently channelling some crazy cat lady vibes with her five lovable, but rebellious cats.


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