I have 5 dogs 4 have that same behavior and it does not bother me either.I crate them it really is safer for them as well.They love to get in the truck in their crate and I don't have to worry about them getting hurt if I have to stop suddenly etc.But if you really want it to stop,you can always use the bark collar or teach the dog a down and have folks walk past etc.after the dog really knows the down correct dog for breaking the down dogs really can't bark well in a down position.But people really don't understand how much training is really needed.It takes time and don't give a command if it can not be enforced.BUt always make sure the dog knows it.And that means lots of training under distractions for long periods of time and distance from the handler etc. which will take time and dedication.I have 5 dogs and train in French ring with many titles under my belt.Wish you best of luck