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I am sorry you are worried.
Is she acting like this
https://www.youtube.com/watch?v=bTuegZFzkOk How long is she walking this way?
Has she ever had kittens?
You do not need to worry one bit. Rosa is experiencing a heat cycle.
For the next week to ten days she will howl, push up against things. walk with her end up, etc.
They don't usually limp but it is possible.
When you get her spayed Tuesday you will stop this behavior.
In the meantime she should be just fine......loud but fine.
Please let me know if you wish to discuss this further.
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