Dog walks perfectly alone, goes nuts if we bring his sister.

My family of 4 people has 3 dogs. Our largest is a 2 year old 65 lbs male. He completed the petsmart beginner class a year ago and is generally well behaved but high energy. His only major problem is overly excited greetings when we come in the door. When walked by himself, he walks on a loose leash attached to his collar. He will stare down strange dogs and people without barking and responds to a leave it command.

We have 2 female dogs, 3 year old 20 lbs and an almost 2 year old 45 lbs. (yes we got 2 large puppies at the same time- my parents were convinced by the rescue while I was out of town.)

If the male spots either of the girls on a walk, either because two of us take both at the same time, or just at a distance if one dog is getting home and one is heading out, he is completely unruly. He will leap 3-4 feet into the air and pull forward at top speed until he’s close enough to touch and then he just flails in place from excitement getting everyone tangled in a leash. He can’t be distracted by our voices, treats, or even by hard taps to the nose or hip. We’ve used multiple harness styles that did not give any more control. The girls like him, but do not match his intensity.

Inside the house he’s the most calm out of the trio. We’re working on some tension between the girls but he gets along perfectly with everyone and has pretty good cat manners too. I’m just stumped on how we can ever walk more than one dog.