nana2

I have a 3 month old fox terrier. Hes begun being a bit agressive towards me. When i pick him up to put in his crate he growls at night. Then today he bit me on the leg for not playing with him. I had been, but i had to do something quickly. I need to put a stop to this and need help please! I firmly tell him no and i don't hit or yell at him. ( thats not why hes started is why i am saying so)