That is simply incorrect. Shock collars do emit electric shock. A static shock is still an electric shock. It hurts - that's the point and that's why it works.
http://en.wikipedia.org/wiki/Shock_collar
Shock collars are sold as shock collars because they give electric shock. If they didn't give electric shock it would be false advertising. If it is a vibrate only collar it would be sold as such. Some shock collars do have a vibrate function too but they are still shock collars since they are capable of giving an electric shock.
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