Why do female dogs hump?

My 18 month old Havanese humps a lot. Sometimes she gets so worked up It seems like she might hurt herself. Could she?

Irritation or itching in the genital area can cause both male and female dogs to hump in response to the physical sensation. Be alert to this possibility, and of course have your veterinarian prescribe treatment to correct any underlying condition.When a female dog is in heat, she, other females, and of course the males around her may turn into humping fools. Of course, this would be sexual arousal. The excitement of the situation can lead to fighting, as well as the strong possibility of an accidental pregnancy. Female dogs in heat need to be kept under top security!

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