They are great little watch dogs and will guard their home intensely. It was a precious display of a Min Pin's natural desire to keep strangers at bay. Min Pins have no fear of other living creatures that are much larger because they don't know they are small. A Miniature Pinscher is born a 'professional moocher' and will stare you down for the smallest morsel of food. For this reason, feeding a Min Pin scraps from the table is not a good idea no matter how cute they are.
Bad habits are hard to break.
They are very stubborn, are independent thinkers and will challenge their humans on every point and argue with a sign post. It's best to let them know from the start who is boss. Be prepared for them to guard your bathroom door when you are in there. After a bath, they'll lick your toes. They will lick your eyelashes as a sign of affection.