The mail man loves max.. no treats, but lots of hugs & kisses.. Now the UPS guys r a different story.. ok my dad lives in 3 apt house. the 1-2 apt share the same little hallway & the 3 has its own door on the side of the house. My dad isn't home during the day, so the old lady in 1 take the UPS stuff for him. One guy was so scared due to Max's agressive barking, loud sniffing, loud walking, & shaking the door. the UPS guy thought it was a full house & not 3 apt. he was hiding outside the dor & was shaking really bad... he kept begging not to let the dog out, where is it. the old lady prazes Max for his agression at the door when dadsa not home.. it makes her feel much safer.. & when she tells Max hes gone & to stop barking, he stops & goes right back to bed until the next person knocks on the door