Ok,i need some advice on Kodie.He's been doing the most embarrising thing for me.i hate it and want it to stop!When we go for walks,he'll bark at other dogs when theyre walking by.This only happens when he doesnt get to say "Hi" to them.Its really bad when the dogs are running by Its really embarrising,and i think it scares the crap out of people.A big dog,with a big deep bark,barking and lunging at them He doesnt mean anything,just like i want to play,stuff like that.When dogs are coming by,i hold him close to me,i tell him "no",sometimes he responds to "no",but most the time he doesnt.It seems to mostly happen with dogs that are smaller than him.
I'm currently walking him with a Prong collar,which he does wonderfully with,but doesnt help with his problem.I suggested to my parents that we get him another Halti(his other one got chewed by a little black puppy named Lucy).Do you think that would help?I would be able to hold him closer to me,and he wont be able to bark.Or would you suggest something else?

-edit-
He started this when we got Lucy,could it be he's protective of her?She is his little girl