The Bull Jack diet will need to include animal proteins, carbs, vitamins, minerals, and omega fatty acids--nutrients every dog needs to maintain its health in the long term. This means the best Bull Jack dog food is premium dry kibble, as it has balanced portions of the above-listed ingredients.
Recommended brands include Blue Buffalo, Royal Canin, and Taste of the Wild--all of which have excellent lines of premium dry food.
Adult Bull Jacks, depending on their size, age, and activity levels, will need about 2½ cups of dry food per day, divided into two meals. Bull Jack puppies will need a bit less: again depending on age, about 1¾ cups per day, divided into three meals (not two) until six months of age.
For more info on feeding a Bull Jack from puppyhood through maturity, see this feeding chart:
Dog AgeDog WeightFood TypeAmountFrequency2 Months5 lbsDry (Puppy formula)0.33 cups3x/day3 Months10 lbsDry0.4 cups3x/day6 Months20 lbsDry0.6 cups3x/day9 Months25 lbsDry* (Puppy/Adult)1 cup2x/day12 Months+30 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, for one week.
Try if possible to stick to the above-listed amounts. If constantly over-fed (and under-exercised), these dogs will easily become overweight--and a fat Bull Jack will have numerous health problems and a potentially shortened lifespan. You can help control your Bull Jack'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 Bull Jack 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!