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  Maybe she's grown some more in that area--like she's just maturing?? If its not silent heat and its not a UTI..I cant think of anything else. My yorkie girl has had two heat cycles...with the second heat cycle her vulva did decrease in size, but didnt go back to teeny tiny like she did after the first heat cycle. 
 I'm interested in finding out what the vet thinks....please followup and let us know.
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