It takes up to 3 yrs old to get their full coat so that wouldnt be an issue. Also lots of Chis have longer muzzles. There are so many people breeding chis and not necessarily to better the breed so Chis come in all shapes and sizes now days
I would say that he could be full chi or possibly mixed with Pomeranian or spitz? Regardless of whether he is full or not he sure is stunning and I love his color
How old is he and how much does he weigh?