Once they leaved the Castle, the problem was how to reach the Forbidden Forest without attracting the attention of Hagrid's big Newfoundland dog, who could scent mischievous students even better than his enormous owner. The gamekeeper was inside, the light was on. Not only was smoke coming out of the chimney, but also a sweet smell reminiscent of chocolate biscuits, although it was rumored that his sweets were more akin in appearance and solidity to that Muggle artifact called "reinforced concrete".