Stud-Acting Mare

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My girlfriend has a 6 year old Arab mare that in the past year or so has been acting more and more like a Stallion. She will get aggressive & even try & mount my girlfriend...She does not do this if eating. I thought maybe the mare would have a Cyst or something on an ovary? OR maybe a hormone inbalance. She has never been bred.
It is likely a hormonal problem possibly caused by a tumour vs a cyst. This mare should be palped, ultrasounded and blood taken for hormone levels. A good repro vet will have no problems diagnosing the problem! Good Luck V

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