1. Feed a high-quality diet: Choose a dog food that is specifically formulated for your dog's age, size, and activity level. Look for a diet that is high in calories and protein, and that contains healthy fats.
2. Increase the amount of food you feed: Gradually increase the amount of food you feed your dog by 10-20% per day. If your dog is still losing weight, you may need to increase the amount of food even further.
3. Feed multiple small meals throughout the day: Instead of feeding your dog one large meal per day, try feeding them two or three smaller meals throughout the day. This can help to keep their blood sugar levels stable and prevent them from feeling too full.
4. Add high-calorie treats to your dog's diet: You can add high-calorie treats to your dog's food or give them as rewards. Some good options include cheese, peanut butter, boiled chicken, and cooked sweet potatoes.
5. Encourage your dog to exercise: Exercise can help to build muscle mass and increase your dog's appetite. Try to get your dog at least 30 minutes of exercise each day.
6. Rule out any underlying health conditions: If your dog is losing weight despite eating a healthy diet and getting enough exercise, there may be an underlying health condition that is causing the weight loss. Talk to your veterinarian if you are concerned about your dog's weight.