Mt 2yr.old Akita Kujo is a very sweet and friendly dog but fiercly protective.He's fine when my hubby is home but when he's not Kujo becomes another dog.I can't open the door unless it's family or friends and when I walk him if anyone even comes in my direction or speaks to me that he doesn't know he growls and lunges towards them.I can get him under control very quickly but I'm curious if this is a behavior I should correct and if so how/Any advice would be appreciated.