If you don't to topknots, then cut'em
It's very difficult to keep a topknot clean, non-matted, and not in the way.
I put 6-8 latex bands in Fido's hair every day to keep it clean :P and it's hard work..
It's the only way it can grow out, to put so many bands in.
I'd cut them yourself, the bangs, if you are not a topknot person.