I am not in any way exaggerating when I say that this leash is the very best solution for dogs that like to make mad dashes after who-knows-what.
I'd been using other standard extendible leashes for my two large dogs -- but one of them has that incurable "chase" instinct. Squirrels, birds, chickens, other dogs... if it moves, he'll chase it. And he is FAST once he gets going. If you're not holding tightly to the leash, he will pull it right out of your hand... and even with a firm grip, he stil...