Several factors need to be considered in deciding the best weight for any individual greyhound. A highly conditioned dog will have more muscle mass, which is both denser and heavier, than the same size dog that is out of condition. Age, exercise, stress caused by both heat and cold, and general health all influence the best weight for an individual dog. Consult a qualified veterinarian, preferably one familiar with sighthounds, about the ideal weight for a greyhound, then try to maintain it. Smaller meals fed more frequently are generally recommended for large chested dogs that may be susceptible to bloat.
Dog treats add calories.
Include treats in the calorie count along with all other food. Vitamin supplements may not be necessary, but they will not likely harm a dog either. The best policy is to consult a qualified veterinarian. Total caloric intake to maintain a good weight for a greyhound will be influenced by the dog's age, the amount of regular exercise, and in some areas, the time of year. A dog recovering from an injury or severe illness will need more calories than an otherwise healthy dog.