Gina has in the last 2 months, started a sort of trilling growl/bark, it's rather funny, although it leads up to a full bark most of the time. Gina's barks are so very different from my old girl, Megan, but yes they have been changing over the last 6 months.
Cheers Quad & Gina
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RIP Megan 3/1998-5/28/2013