Changing my dogs food

Question
We have two Boston Terriers who we have been feeding Natures Best
by Science Diet for over 6 months.  The food is so expensive I would like to change them back to the less expensive Science Diet.
Does this require mixing or since it is Science Diet (differnt mixture)  can I just do it with out any mixing? Thank you for your time and response.

Answer

seven day feeding tran Even with Science Diet, which is the best food you can feed, it is prudent to switch them over slowly to avoid any stomach upsets.
The formulas are different, so it is best to wait until the first bag is almost empty then do the seven day switch as they show on the bag.

The great thing about Nature's Best is that it truly is all natural and even the colored bits are colored with vegetable dyes. They are also totally pesticide free.

But SD regular and light are great foods. Make sure you always use an 8 oz measuring cup to give them their food every day- that way you will save money. This food is so nutrient dense that they do not require a lot of food to get their optimal nutrition and energy needs.

Here is an image of the seven day transition.