The English Springer Spaniel diet 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 English Springer Spaniel dog food is premium dry kibble, as it has balanced portions of the above-listed ingredients. If consistently fed a premium brand like Royal Canin, Springer Spaniel dogs will be much healthier and longer-living.
Specifically how much should a Springer Spaniel eat? Adult Springer Spaniel feeding portions are about 2½ cups of dry food per day, divided into two meals. Springer Spaniel puppy food portions are a bit smaller: depending on the pup's age, about 1¾ cups per day, divided into three meals (not two) until six months of age.
For more info on how much to feed a Springer Spaniel, here's a handy Springer Spaniel puppy feeding guide:
Dog AgeDog WeightFood TypeAmountFrequency2 Months8 lbsDry (Puppy formula)0.3 cups3x/day3 Months15 lbsDry0.4 cups3x/day6 Months30 lbsDry0.6 cups3x/day9 Months40 lbsDry* (Puppy/Adult)1 cup2x/day12 Months+50 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 they're not especially prone to obesity, if constantly overfed (and under-exercised), these dogs certainly can become overweight--and a fat Springer Spaniel will have numerous health problems and a potentially shortened lifespan. You can help control your Springer Spaniel'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 English Springer Spaniel is overweight, try this simple 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!