tikeyas_mom u did it all wrong!!!!!
u can't just stick it on a dog & take it out for a walk & expect a merical!.. ur supose to put it on her in her home & let her run around for a while with it on. It takes time to get use to it, u really scared her. Get lots of treats or ppl food she loves & it'll take her mind off it. But u can't pull on it nor tighten it while shes getting use to it. She needs to learn not to fear it... give it alittle longer, before u return it.