An 8-year-old boy was rescued after he became trapped in a bog in Weston during a walk in the woods with a young girl, fire officials said. The two children got caught in the mud at about 1:50 p.m. in the area behind the Cambridge School of Weston, said Weston Fire Lieutenant Justin Woodside. The girl, who was 7 or 8 years old, was able to pull herself out, but the boy was immobile, stuck in the muck up to his waist, said Woodside. He was trapped for 10 or 15 minutes before firefighters got to him. It took five minutes to pull him out, Woodside said.