Some of the best dog foods to help with weight gain are Nutro Natural Choice High Endurance, Eukanuba Premium Performance and Dr. Tim's Pursuit Active Dog, according to Dog Food Guru. Regardless of which dog food is chosen, the correct amount must be fed to be effective.
Although these dog foods are not made specifically for weight gain, the food has lots of calories and protein for active dogs. On a non-active dog the calories and protein will turn into fat. When feeding, the calorie intake must be more than the calories being burned throughout the day; feeding 50 percent more than the normal amount is a starting point.