How to Help Your Dog Gain Weight Safely
If your dog is too thin, increase calorie intake by 5–10% and feed higher-fat, high-calorie foods. Use vet-approved methods like adding olive oil, peanut butter, or soaked oat flakes. Monitor progress and consult your vet if no improvement occurs. - Start with small, frequent meals. - Use high-calorie snacks like oat and peanut butter mix. - Rule out illness with a vet check if weight gain doesn’t happen.
Assess Your Dog’s Weight First
Before making changes, evaluate your dog’s body condition. A healthy dog should be slim and athletic, with a light layer of flesh over the ribs. If your dog is underweight, look back at how they looked at around 18 months old—this is often their ideal weight. If you’re unsure, consult your veterinarian to confirm your dog’s target weight and rule out underlying health issues like worms or illness.
Increase Calories Gradually
If your dog is losing weight and no illness is present, the solution is simple: feed more food, more often. Start by increasing daily calories by 5% to 10%. This small boost can make a big difference. If your dog still doesn’t gain weight after this adjustment, consider switching to higher-calorie foods—especially those rich in fat or protein such as meat, eggs, or oils.
Use High-Calorie, Easy-to-Digest Foods
Add calorie-dense, palatable snacks between meals. One effective recipe includes two cups of soaked oat flakes, half a cup of peanut butter, a banana, and a healthy drizzle of olive oil. This mix is easy to prepare and has helped underweight dogs gain weight. For active or high-energy dogs, feeding fattier meat pieces can support weight gain and energy levels. These foods are especially useful for dogs with fast metabolisms, such as small breeds.
Monitor Progress and Adjust as Needed
Keep track of your dog’s weight and body condition weekly. If your dog is gaining slowly or not at all, reassess your feeding plan. If no progress is seen after 90 days, consult your veterinarian—this could signal a medical issue. Adjust meal size, frequency, and food type based on your dog’s response. Once your dog reaches a healthy weight, reduce portions slightly and maintain the ideal weight through consistent feeding habits.
Avoid Common Mistakes
Don’t assume your dog needs to be fed every day—some dogs do well on less frequent meals. Also, avoid feeding low-calorie, high-fiber foods like carrots or spinach if weight gain is the goal. These are better suited for overweight dogs. Focus on animal-based proteins and fats, which are the primary energy sources for dogs. Never ignore your dog’s health signs—persistent weight loss despite proper feeding should always prompt a vet visit.
Frequently asked questions
How long should I wait to see weight gain?
If your dog isn’t gaining weight after 90 days of increased calories, reevaluate your strategy with your veterinarian.
Can I feed my dog peanut butter to help them gain weight?
Yes—peanut butter is a high-calorie food that can be used in snacks to support weight gain, especially when mixed with oats and oil.
Sources
- Raw and Natural Nutrition for Dogs The Definitive Guide to Homemade Meals · Lew Olson · PART II
- The Plant-Powered Dog · [Author not specified] · (APOP, 2019)
- Give Your Dog a Bone · Ian Billinghurst · page 289
- Raw Dog Food Make It Easy for You and Your Dog · Carina Beth Macdonald · (Z-Library)
⚠️ Important: this article is a literature summary, not a case diagnosis. Every dog is different — breed, age, and history all affect the plan. For severe anxiety or aggressive barking, contact a certified behavior trainer or veterinary behaviorist.