It will most likely be just fine since it is not gaping open at all. She is probably going to pick the other one out so I would put something like Ben Gay around it so she will leave it alone.
When you put the cone on do you have it through her collar? If she does not wear a collar you can use string guaze (it is long gauze that is about 1" wide )and loop it through the loops to hold it on tighter.
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