The Pomsky diet will need to include animal proteins and carbohydrates, vitamins and minerals, and omega fatty acids--nutrients every dog needs to maintain its health in the long term. This means the best Pomsky food is premium dry kibble, as it has balanced portions of the above-listed ingredients.
Adult Pomsky dogs, depending on their age, size, and activity level, will need about two cups of premium dry food per day, divided into two meals. Pomsky puppy food portions are a bit smaller: depending on age, about 1½ cups per day, divided into three meals (not two) until six months of age.
For more info on feeding a Pomsky from puppyhood through maturity, see the following:
Dog AgeDog WeightFood TypeAmountFrequency2 Months4 lbsDry (Puppy formula)0.25 cups3x/day3 Months7 lbsDry0.33 cups3x/day6 Months15 lbsDry0.5 cups3x/day9 Months20 lbsDry* (Puppy/Adult)0.8 cups2x/day12 Months+25 lbsDry (Adult formula)1 cup2x/day*--Around this time, transition to adult food by first mixing in a bit of adult formula with the puppy formula. Over the course of a week, with each meal add a little more adult formula to the mixture, until the dog is eating it entirely.
If possible, try and stick to the above-listed portions. If constantly overfed (and under-exercised), these hybrids can become overweight--and a fat Pomsky will have numerous health problems and a potentially shortened lifespan. You can help control your Pomsky'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 Pomsky is overweight, give the dog this simple test: run a hand along its side, and if you can't feel any ribs, it's diet time--which means less food and more exercise!