If he is pulling that much, putting a choke collar on him will only do exactly that, "choke" him, and possibly do damage to his trachea. Try a martingale style collar instead, at least it will tighten only a certain amount and not continue to tighten if he continues to pull.
"To my mind, I hold that the more helpless a creature, the more entitled it is to protection by man from the cruelty of man."
"The greatness of a nation and its moral progress can be judged by the way its animals are treated."
Golden Retriever Rescue of North Texas