I had Er surgery in january for my appendix, and when I came home I was overwhelmed with the thought of grooming them. I proceeded to cut each one down,mind you I was still very sore and medicated so I had no business attempting this at that time.All their hair was long to the floor.One worse or better than the other I cut the body and bangs.My oldest boy was the worse.I have posted no pictures because they look pitiful,of course I still love them

.but my eldest boy has been cut down twice by me and he is 21/2 yrs old and his hair was to the floor again this last time I cut him.And I do not consider him to have a particularly fast growing coat.Hope this helps.
So to sum it up yes It will grow back and before you know it.