Changing your fursona is ok to do I am thinking of doing so myself to be honest. But mine is really the first thing i knew how to draw.

Your sona may change but you are still the same person. Your old sona can simply be a character you can draw now and them along with the new one stick with what you are comfy with.

It's your choice uriburr, I will Miss burr you though x3

Oooh! A hyena! Love 'em... though I like bears a bit more. x3

It's up to you if you wanna change your fursona or not. Go ahead with what you think is best. ^^