My one and only dog encounter to date happened a block from my house with a dog I knew and knew the owner. The yard was invisible fenced and the dog was never outside the fence riding by he would run out and I would say Hi Bacon. He is a monster Airedale.
On this day I couldn’t find my water bottle and saw a Empty mountain dew bottle on the counter rinsed it out and filled it with water and off I went. Bacon comes running out like normal and blows thru the invisible fence like it was turned off and dives at my bike flipping me over. He grabs my mountain dew bottle and blows back to the house. The owner sees the whole thing and comes out yelling at the dog and telling me how sorry he is and that the dog has never done that before. I had luckily slowed down enough that I was just shook up and didn’t see any damage to the bike. He said what caused him to do that and I said I don’t have a clue but he took my water bottle and when he saw it was a green dew bottle he said OMG he had trained him to retrieve Mountain Dew bottles as a cheap doggie toy. He offered to pay for repairs to me or the bike and even to do something with the dog if I wish that. He did say he can turn the fence up somehow or the collar and he would do that and I said trust me I won't come down the road again with a green bottle.
I just left it at that, but it did show me how fast a dog can flip you. I also believe it's better to stop and defuse the chasing thing than try and outrun them. They also say don’t make eye contact with a mean dog to turn and look away and the dog doesn’t feel challenged. The bottom line is I have dogs and they stay on leads and letting untrained dogs run free the owner has a lot of responsibility and not a leg to stand on if something happens to their dog.