I heard that, don’t forget I have super sensitive hearing.
Puggles like any dog, have great hearing. They will hear if someone is outside your house before you do and they are likely to bark at a stranger. They may sound like they’re a guard dog but they will probably smother the stranger in kisses rather than attack them.
Nonetheless, they will always let you know when someone is near or outside. Really all puggles want to do is say hi to whoever is going past and to let them know that they are the dog of the house.