A lot of bigger dogs, including Huskies, have a period in their growth process where they start growing extremely fast. With smaller dogs, this is not as noticeable as with bigger dogs. The growth spurts are not considered to be a bad thing. It can cause some problems if they are severe, especially some joint problems, but in most cases it is just the natural way of growth for many dogs. Pet owners will for sure be shocked by the speed of their dog growing into adult dogs so enjoy every moment when they are puppies and take a lot of pictures because it will pass in no time.