SHOULD I CHANGE MY SHIH TZU BRAND OF DOG FOOD SHE HAS BEEN EATTING PUPPY CHOW SINCE SHE WAS 2MONTHS OLD?

That's what i did with my dog but then when he got to be an adult i got him dog food but its soft so it still like puppy food just got everything he needs now that hes growing up.. bc he wont eat the hard food he to use to the soft puppy food but it does the same thing soft or hard