How much should I feed my 4 1/2 (four and a half) month male Siberian Husky Puppy?

I feed him Acana Puppy and Junior Kibble. I've had him for a month now and I used to feed him half a cup but he's been howling sometimes, meaning he's getting hungrier. I don't want to deprive him and I don't want to over feed him either. Please help soon!