Found in the blood and in the fluid that surrounds cells, sodium maintains the cellular environment and prevents cells from swelling or dehydrating. Sodium is also important for maintaining proper nerve and muscle cell function.
Meat, poultry, fish, and eggs are good sources of sodium. IAMS™ dog food is made with chicken, which is a great source of protein.
Sodium also might be included in commercial pet foods in the form of table salt (sometimes listed on the ingredient panel as salt). Salt is an important palatant for animals, as well as for people.
The Association of American Feed Control Officials recommends that dry dog foods contain at least 0.3% sodium for both maintenance and to support normal growth and development. This is the minimum recommended levels.
While high sodium intake might cause increased thirst and water consumption, the extra sodium is excreted in the urine of dogs. Healthy dogs are able to consume diets with higher sodium levels than those found in most commercial pet foods without increased blood pressure or gain in body water.
Therefore, the sodium level in commercial pet foods is not a cause for concern in healthy animals.

A veterinarian might recommend decreasing a dog's sodium intake if the animal has some types of kidney, liver, or heart disease, in order to help decrease high blood pressure or the accumulation of excessive body fluid.
Although older dogs might be more likely to develop these diseases, healthy older dogs do not require a low- or reduced-sodium diet.
The sodium level in our dog foods is appropriate for a healthy dog. The sodium content in these foods is balanced in proper proportions with energy, other minerals, vitamins, fats, proteins, and carbohydrates.
Worried that your small-breed dog is packing on the pounds? Run your hands along his backbone. You should be able to feel (but not see) his ribs. You also should see a clearly defined waist behind the ribs. If you can’t, follow these seven tips from Debra Eldredge, a veterinarian and co-author of “Dog Owner's Home Veterinary Handbook,” published by Howell Book House.
Before you put your overweight dog on a diet, schedule an appointment with the vet to make sure an underlying health problem isn’t causing the numbers on the scale to creep up.
Snacks and table scraps might account for your overweight dog’s bulging belly, Eldredge says. If curtailing in-between meals doesn’t make a difference, consider continuing with the same amount of food but switching to a different formula. Your vet can give you guidance.
Thawed frozen green beans, canned pumpkin (which is fiber-rich and filling) and cut-up carrots make satisfying, low-calorie snacks for your pet.
Apart from veggies feed them food high in nutrition. Check out the article that talks about nutritional needs of small breed dogs.
A study showed that dogs can count up to six or seven, Eldredge says. If he is accustomed to getting two small biscuits as a treat, break one biscuit into two pieces. By his count, he’s still getting two treats!
As much as your overweight dog loves treats, he also loves taking walks, playing and spending time with you. You also can replace biscuits with a couple of pieces of the kibble he would get during mealtime.
Is your bichon staring up at you with those beautiful eyes as you nibble on peanuts? He’s probably not hungry. As you have your snack, offer him a piece of kibble. If he turns it down, he’s not really hungry — he just wants your peanuts!
If your overweight dog has just a couple of pounds to lose, it can be hard to gauge whether he is making progress. Ask your clinic if it’s OK if you stop in once a week so he can step onto the doctor’s scale.