Ugh!! That sucks! I had something similar happen to me in a local grass field. I was kiting my then brand new wing, when a dude and his unleashed giant poodle-looking dog came up. The dog started running through my lines, got tangled, panicked, and could have easily torn the glider. The dumbdumb just watched his dog and I struggling, instead of immediately grabbing him and getting the heck outta there. He was apologetic, but how about instead of watching, you come take control of your panicked animal? Clearly it hasn’t been trained to behave off-leash. By now our dogs know better than to get near gear, but you never know what to expect with strangers. :-/