All dogs are different, even if they are the same weight, it has alot to do with their activity level and their basic health level.I have supplied some information below about daily nutritional guidelines for dogs and some tips for keeping your dog's weight maintained. If your dog has a problem maintaining their weight then you should first rule out any health issues that could be causing the weight loss. If you dog is very lean then I suggest increasing the calorie intake by 25% by what the standards state on the food you are feeding and this should help keep the weight up on your dog. I suggest reading the tips below as they can be very helpful in proper nutrician for your dog. Calorie intake depends on the dogs activity level, wellness level, and of course weight. Follow the instructions on any AAFCO approved food for your dog, and if you are feeding the recommended daily allowance and your dog is not keeping their weight up or is losing weight that is a sign to increase the intake to a higher calorie type dog food.
Good nutrition and a balanced diet are essential elements for good health in a dog. Your dog needs plenty of fresh water and should be fed good quality food in amounts just right to meet his energy requirements. Inadequate or excess intake of nutrients can be equally harmful. AAFCO Standards: All foods should conform to AAFCO standards (check the label). This indicates the manufacturer is following the national consensus recommendations for dog foods.
Most dry dog foods are soybean, corn or rice based. Some of the better brands have meat or fish meal as the first listed ingredient. Although higher priced, they are worth looking into. Dogs eat less of the higher quality products, thus reducing the cost. Dry dog foods also have greater "caloric density" which means simply, there is less water in a cup of food as compared to a canned food diet. This is not a big issue for our smaller canine friends, but large dogs may have difficulty eating enough volume of canned food to fulfill their caloric needs (because they also get a lot of water in that food). Overall, the choice of "dry" vs. "canned" vs. "semi-moist" is an individual one, but larger dogs (such as those greater than 30 pounds) should be fed a dry or semi-moist food in most circumstances
Proteins, fats and carbohydrates are necessary for energy. Dietary requirements for dogs can vary according to activity and stress levels and medical history. Dogs expend energy in many different ways. For example, outdoor dogs are likely to experience increased levels of exercise and thus require a higher percentage of protein and fat for energy production than a dog who stays indoors most of the time. Dogs in various life stages [including puppy ("growth"), adult and senior ("geriatric")] require different amounts of nutrients. Special situations such as pregnancy and nursing puppies can dramatically affect nutritional needs. Working dogs need more calories, while the "couch potato" needs less (just like us!).
The Association of American Feed Control Officials (AAFCO) is an organization that publishes regulations for nutritional adequacy of "complete and balanced" dog and cat foods. Your pet’s food should conform to minimal AAFCO standards. Diets that fulfill the AAFCO regulations will state on the label: "formulated to meet the AAFCO Dog Food Nutrient Profile for…(a given life stage).
Food Type: The choice of canned, semi-moist or dry food is an individual one, but if your dog is more than 30 pounds, dry food is preferred as the base diet for its greater caloric density (more calories per volume of food). There are a number of excellent dog food manufacturers.
Water: Always provide plenty of fresh water.
Consider Your Dog's Age
For puppies (less than 8-9 months and less than 30 pounds): Feed your puppy a consistent canned, semi-moist or dry dog food designed for puppies. If your dog weighs more than 30 pounds, dry food is preferred for greater caloric density.
For adult dogs (8-9 months to 6 years): Feed your dog a consistent canned, semi-moist or dry dog food designed for an "adult" dog.
For senior dogs (7+ years): Feed your dog a consistent canned, semi-moist, or dry dog food designed for a "senior" dog.
Consider Your Dog's Body Weight
Underweight dogs: Feed your dog 1-1/2 times the "usual" amount of food and make an appointment to see your veterinarian about your dog’s body condition. Consider switching to a food with higher protein and fat content.
Lean dogs: Many healthy dogs are a bit thin, especially active young male dogs. Consider increasing total daily food or caloric intake by 25 percent. Weigh your dog every week if possible to chart progress.
Chubby dogs: If your dog is a bit overweight, try increasing the daily exercise routine. Gradually increase exercise over 2 weeks unless limited by a medical condition. If these measures fail, cut out all treats and reduce daily intake of food by up to 25 percent.
Fat or obese dogs: Stop all treats except vegetables. Increase exercise gradually over 2 to 3 weeks if not limited by a medical condition. If these measures fail, reduce the total daily food amount by 25 to 40 percent, switch to a low fat/high fiber diet, and call your veterinarian to discuss your plans. Inquire about prescription-type reduction diets that can really be effective while providing balanced nutrition.
There are a number of prominent manufacturers of high quality dog foods, including Iams (Eukanuba), Hill’s (Science Diets), Nature’s Recipe products, Nutra Max, Purina and Waltham, among others. Follow the label recommendations, but use your own judgment in determining how much to feed.
How much to feed?
The best determinant of the amount of food to feed is the dog himself. Food intake in all animals is governed principally by energy requirements. When dogs are successfully fed freely, the underlying control over the amount of food that is consumed is primarily the need for energy. When dogs are fed on a portion-controlled basis, owners should select a quantity of food based primarily on the pet's weight and body condition. If the dog gains too much weight (energy surplus), the amount should be decreased. Conversely, if weight is lost, an increased amount of food is provided. Commercial pet foods that are sold for particular life stages or lifestyles are formulated to contain the proper amount of essential nutrients when a quantity is fed that meets the dog's energy requirements. Balancing energy density with nutrient content ensures that when a dog's caloric needs are met, its needs for all other essential nutrients will be met by the same quantity of food. Therefore, the best way to determine how much to feed a particular dog is first to estimate the animal's energy needs, then calculate the amount of an appropriate food that must be fed to meet that need. http://www.1stchoice.ca/en/fiches/fiches_chiens_nourrir.asp