My rescued dog grabs my forearm in his mouth and clamps down, usually when we are leaving the house for a walk. Besides a muzzle is there anything you can recommend?

My question concerns my rescued Malinois. I have no info regarding his breeding or origins. He came into rescue after being treated for a broken leg (right femur shattered - his previous owner did not treat, and it healed on its own). He was crated continuously for 24 hours and given one walk per day. He was not fed properly, and was wormy when rescued. He has been neutered within the past month. He is approximately 1 year old.

Given what he has been through, he is a good boy. He has some issues, as expected, but only one major problem I would like help with. He will grab my forearms and clamp down on them, and when he starts this behavior it is difficult to stop him. He is not angry or frightened, just determined to grab. This behavior occurs during walking, usually just after leaving the house. I have purchased a muzzle for the short term, but would like a long term and non bruising solution for this problem. Thanks!

Thanks so much for the helpful advice. He is my first Malinois. I am glad he is finally well and strong enough to get excited, just not on my arm.