The Silken diet will need to include animal proteins, healthy carbs, vitamins, minerals, and omega fatty acids--nutrients every dog needs to maintain its health in the long term. This means the best Silken Windhound food is premium dry kibble, as it contains balanced portions of the above-listed nutrients.
Blue Buffalo, Royal Canin, and Taste of the Wild are three recommended brands that carry excellent lines of premium dry food.
Adult SWs, depending on their size, age, and overall activity levels, will need about 2½ cups of premium dry food per day, divided into two meals. SW puppy food portions are a bit smaller: again depending on age, about 1¾ cups per day, divided into three meals (not two) until six months old.
For more info on feeding a Silken Windhound from puppyhood through maturity, see this feeding chart:
Dog AgeDog WeightFood TypeAmountFrequency2 Months7 lbsDry (Puppy formula)0.25 cups3x/day3 Months12 lbsDry0.33 cups3x/day6 Months25 lbsDry0.6 cups3x/day9 Months33 lbsDry* (Puppy/Adult)1 cup2x/day12 Months+40 lbsDry (Adult formula)1.25 cups2x/day*--Around this time, transition to adult food by mixing in adult formula with the puppy formula, in slowly increasing amounts with each meal, for one week.
Try if possible to stick to the above-listed portions. Though not especially prone to obesity, if these dogs are constantly overfed (and under-exercised) they can become overweight--and a fat Silken Windhound will have numerous health problems and a shortened lifespan. You can help control your SW's weight by having consistent feeding and exercise schedules, by not feeding the dog table scraps, and by not leaving food in the dog's bowl all the time.
If you're worried your Silken Windhound is overweight, try this test: run a hand along the dog's side, and if you can't feel any ribs, it's diet time--which means less food and more exercise!