Oreo is a Lab and has had the same problem since she was young (she's 5 now). Her vet prescribed a hormone called diethylstibestrol (DES), which she takes 1 caspule twice a week. It has stopped the problem.
She had tried a different medication (phenylpropanolamine) before we found this one, but the side effect was that it made her very agitated and restless.
I hope that you can find a solution that works for you and her and that doesn't interfere with her knee medication. Best wishes--
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