My mini Dixie just turned one year old. She is spayed and is doing the same thing. We are so puzzled also.
Have you considered having her de-sexed before she came into her first cycle.? Are you a registered breeder and have litters planned for her? Talk to your Veterinarian about the number of times during a normal life-time she will be "on heat". Hope this helps you but more importantly her.
Get little boy underwear and put in a pantyliner, then put the underpants on the dog backwards with the tail going through the opening and then you just have to change the pantyliners.
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