It can be hard to tell when they are and aren't going thru a growth spurt. One of the things about huskies is that they can be pretty good at self-regulating their food intake. They were bred to expend a lot of energy on little food consumption. I used to regulate my dogs' food by putting it out at specified times, but once Volya came into the house, I was afraid I wouldn't feed him enough thru a growth spurt, so now they free feed and I notice that when Volya is eating a lot, he's growing and when he's eating very little, he's not. He's just eating based on his body's need which is probably what your pup is doing as well.