I use Purina one now but would like to change to something healthier, any suggestions?

i thought i let you in on something when you change a dogs food you must introduce the new food slowly the first time but in the original food but put an 1/8th of the new for 3 days then for the next three day 1/4 for three days then 1/2 for threee days then 3/4's for the three then make all of it the new food hope i helped changeing a dogs food all of a sudden isnt good for the dog