That can be scary. My girlfriend’s dog barks and lunges but luckily she is small (11 lb) and easy to hold back on the leash. We try to warn people from a distance that she isn’t friendly so they don’t try to approach, and hold the leash close so she can’t get near anyone passing by. I was bitten by a big dog in the past so aggressive dogs make me a bit anxious. Unfortunately not everyone gives a shit how their dog’s behavior can affect others. I hope you can avoid that dog in the future.