<human>: Back story: I live in Michigan. My rescue dog, Meatloaf, is a shar pei/english mastiff mix. Weighing in a 80 pounds, he is a big boy. He has been part of our family for 2 years now and is up to date on all shots. He has never shown signs of aggression towards people and only shows aggression towards other dogs when it comes to his food (growling, never biting). We live down the road from a skate park and the kids are always harassing my dog through the fence, so, naturally, he hates skateboards. 

Today, on our daily walk, I was waiting at a crosswalk a couple blocks from downtown (Meatloaf was on a leash) and an 18 year old boy on a skateboard rode up to Meatloaf, jumped off his board and immediately started petting him without my permission. Meatloaf instantly jumped up, bit his face and then got down and walked away from him. The boy was left with a single puncture wound in his nose and one in his chin. 

Living only a couple blocks from the incident, I offered to walk with the kid back to my home (he was headed that way regardless) and allow him to clean himself up and offered him a first aid kit. I offered him a ride to the hospital if he wanted to go, or a ride home, but he refused. I gave him my phone number and told him I would cover any medical bills if necessary. He left and continued on his way to the skate park.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My dog was on a leash and bit an 18 year old who pet him without permission. He has never bitten before and is UTD on shots.