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  I agree I would check the fit to make sure it does not hurt or rub, it is better to be a little big than to be snug.  Maybe run it through the wash a couple of times to soften it.  Otherwise, maybe you could let her run around it in a little bit before hooking up the leash.  Then I would just sit outside with her and play to see if she will just run around in it.  
 I once had a border collie who would lay down when I hooked his leash on his collar.  He wore the collar fine, but had never been on a leash.  The breeder walked the pups outside in a group and they were very well behaved.  I just needed the leash for cosmetics.  It took about TWO WEEKS to get him walking on the leash.  I felt so mean - he would go outside and stand right by me, but the second I hooked on his leash - you would have thought I beat him, he would cower down in a lying position.  But he finally got over it.
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