Dear Lady at the dog park,
It is not play if my dog is laying in the fetal position too scared to move as your dog drags her around by her neck.
It is not play if you have to physically pry your dog off mine several times.
It is not play if my dog can't get away because yours won't let go of her collar.
It is not play if my dog is trying to hid from yours.
This is bullying, it is not ok. If your dog is like this, please keep it on a leash.