The Standard Poodle diet, like that of all breeds, will need to include animal proteins and healthy carbs, vitamins and minerals, and omega fatty acids--nutrients every dog needs to maintain its health in the long term. This means the best Poodle dog food is premium dry kibble, as it contains balanced portions of the above-listed ingredients. In fact, one premium brand has food specifically tailored for this breed: Royal Canin Poodle Food (which includes Royal Canin Poodle Puppy Food, Royal Canin Poodle Junior, and Royal Canin Poodle Adult) is designed to fulfill these dogs' dietary needs at every life stage.
But how much to feed a Standard Poodle? Adults will need about three cups of dry food per day, divided into two meals. Portions of food for Poodle puppies are a bit smaller: depending on a pup's age, about two cups per day, divided into three meals (not two) until six months of age.
For more info on feeding a Poodle, see this handy Standard Poodle feeding guide:
Dog AgeDog WeightFood TypeAmountFrequency2 Months12 lbsDry (Puppy formula)0.33 cups3x/day3 Months20 lbsDry0.5 cups3x/day6 Months40 lbsDry0.75 cups3x/day9 Months50 lbsDry* (Puppy/Adult)1.25 cups2x/day12 Months+60 lbsDry (Adult formula)1.5 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. If constantly overfed (and under-exercised), these dogs will easily become overweight--and fat Poodles will have numerous health problems and potentially shortened lifespans. You can help control your Standard Poodle'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 Standard Poodle is overweight, try this simple test: run a hand along the dog's side, and if you can't feel and ribs, it's diet time--which means less food and more exercise!