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Why Is My Dog Underweight? Common Causes and What You Can Do

Understanding the root of your dog’s weight issues is the first step toward a healthy solution.

Why Is My Dog Underweight? Common Causes and What You Can Do


If your dog seems too skinny or you can see ribs and hip bones, it’s natural to worry. But before you start piling on the calories, it’s important to understand why your dog is underweight in the first place. Let’s break down the most common causes—and how to address them.

Common Reasons Dogs Become Underweight

  1. High Metabolism
    Some breeds like Greyhounds or Whippets are naturally lean and burn calories quickly.

  2. Poor Diet or Lack of Calories
    If your dog’s food isn’t nutrient-dense or they’re just not eating enough, weight loss is inevitable.

  3. Dental Issues
    Painful teeth or gums can make eating uncomfortable, leading to a reduced appetite.

  4. Parasites
    Internal parasites like worms can steal nutrients, leaving your dog malnourished even with regular meals.

  5. Stress or Anxiety
    Changes in routine, environment, or separation anxiety can impact a dog’s appetite.

  6. Medical Conditions
    Issues like diabetes, kidney disease, or thyroid problems can cause unintentional weight loss.


Why Is My Dog Underweight? Common Causes and What You Can Do

What You Can Do

  • Visit the vet to rule out health issues or parasites.

  • Switch to a high-quality, calorie-dense food made for active or working dogs.

  • Offer small, frequent meals to boost overall intake without overwhelming the stomach.

  • Supplement with weight-gain-friendly additives like oils, meats, and toppers.

Weight gain should be slow and steady. Once you’ve identified the cause, you can tailor your approach and help your dog reach a healthy weight safely.