The answer isn’t simple. If you just start reducing the amount of food you feed your dog, your pet may develop behavioral issues, such as becoming destructive, because he or she is hungry! Also, calorie needs vary based on criteria such as age and activity levels. Finally, dogs need specific nutrients so simply reducing the amount of food you’re giving him or her also reduces the essential proteins, fats, vitamins and minerals your dog is getting, which can lead to nutrient deficiencies. “Every single pet is a unique individual with a unique weight loss journey. You need to plan a strategy with your vet or veterinary nutritionist so that your dog gets the right balance of nutrients while losing weight at a safe rate,” Dr. Bullen says. Work with your vet or veterinary nutritionist to devise an overall plan with specific calculations about how much food your dog needs based on age, breed size, activity levels, and other considerations. Your dog also may benefit from a prescription weight loss diet, based on how much weight he or she needs to lose, especially if he or she has other underlying health conditions such as kidney disease.