You don't ever "have" to switch. It is your choice.
I would not feed a very small Yorkie of any age only twice a day and I wouldn't consider switching the schedule til probably after 8-10 months. Just personal preference...
Unless your pup gets a bedtime snack or he eats his kibble up until bedtime, I think there is too much time between the night and morning feedings.
__________________ Crystal , Ellie May (RIP) , Rylee Finnegan , and Gracie Boo🐶 |