Trying to switch dry food, cat eats new food only

I have a 4 month old kitten who has been eating Purina Kitten Chow since that's what his previous owners fed him. He's been settled with us in his new home for about a month now and I wanted to start him on a more healthy dry diet since I do not like the ingredients of Purina.

So now I'm making the switch to Wellness. Yesterday I started to mix a few of the Wellness kibbles in to his Purina (20% wellness, 80% purina). He LOVES the Wellness! He picks out all the Wellness kibbles and leaves the Purina behind. Once the wellness kibble is gone he walks away and won't eat the purina (he also gets wet food that he's been eating for a month now so no worries, kitty is not starving. For work/money reasons, I cannot feed him an all wet diet unfortunately).

This kitty is trying to thwart my attempts to slowly acclimate his tummy to the new food over a week or two. He seems to really love the Wellness food but I'm hesitant to give him all Wellness at once since it may upset his tummy. For now I just keep doing what I'm doing and very slowly add more Wellness to the Purina mix. Any advice? Oh and one more thing, his poops have been a little softer, not diarrhea, but on the soft side. I'm guessing its from the new food change since it started at the same time i began changing his food. How long should I give his tummy time to get used to it before being concerned about the soft stool?

In my experience I've had no need to acclimate my cats to new food. If they love it, that's what I feed them from then on. One or two seem to have softer poopoo the next few days but it does not last. I think the reason for the so called "acclimation" it is just to get them to get used to the taste and texture of the food and maybe to check for any allergy to the new one.

NO the mixing process is not for flavor or texture... it is a prevention of flora issues : diarrhea being the most common... Some cats are fine but you are switching too a food that is much higher in quality protein and fat thus I would try to continue a switch

give at least two weeks before getting worried unless something like explosive diarrhea happens