Dog Too Thin? How to Help It Gain Weight

Nutrition & Diet 📅 August 8, 2026 👁 3358

📝 Summary

Some dogs look thin from poor nutrition, worrying owners. Thin dogs do need to gain weight, but wisely—overfeeding causes health problems. Here is how to help a dog gain weight.

1 How to Help an Underweight Dog Gain Weight

1. Add food supplements

A thin dog may simply eat too little, so supplement appropriately. Not just anything—different foods have different calories; choose by nutrition. High-nutrition canned food also helps with weight gain.

2. Increase portions gradually

A sudden increase disrupts gut balance and causes diarrhea, wasting any nutrition. Increase portions gradually and watch the dog; if it cannot cope, do not force more.

3. Offer vitamin-B-rich foods

Food choice is key to weight gain; vitamin-B-rich foods nourish. Liver is rich in B vitamins—cook chicken liver for the dog. Eggs are also nutritious and well-liked, but not daily—two or three times a week is enough. Occasionally make meat broth so it does not tire of dry kibble.

4. Switch dog food

Long-term low-energy or very cheap kibble causes undernutrition and thinness, so switch to a high-energy formula. Quality food is nutrient-rich and easily absorbed.

Thinness may also mean poor nutrient absorption—likely internal parasites—so deworm internally and externally promptly. If you have other questions, consult an online veterinarian.

Want to learn more about pet health?

Explore our pet health channel for more science-based care guides

Read More Articles →