My prior female Husky chewed a hole through the middle of a chain link fence panel. Not sure how her teeth could get through the metal, and I would never believe it had I not seen it myself.
Their kennel (I had 2 Huskys) was approx 10'x20'. Chain link fully enclosed (had a roof) with a gate set on top of a concrete pad. Came home to my dog on the front porch???? WTF?!?! They had pulled back corners, and bottoms before so I had taken wire and wrapped the panels 100% around the poles.
Went out back, almost dead center of the side panel there was a hole. She had broken some strands, and pulled back a hole to slip through.
So, breaking off a lead....pssshhhhht, piece of cake.