I hate to muddy the waters here, BUT if you read how I acquired my furbaby I knew very little about her and the breed in general. I saw her.. feel in love and bought her on the spot. I was browsing through a thrift store at the time
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I can not tell you how much joy and laughter she has brought into our lives. I couldn't begin to put a price on that.
I still don't know all that much more and really don't care. I did get her pedigree but the original breeder has since passed.
If I were you.. I would think about what your objectives are. Are you thinking about breeding or just want someone to love you and someone you can lavish your on.
If you have apprehensions why not make an appt. with a vet in the area and have him look her over. If everything is above board the current owner shouldn't have a problem with that. Leave her something of value that you most definitely want back. If she objects.. something may not be quite right.
If things don't work out with this one.. for sure keep searching. Buying my little sweetie is one of the best decisions I have ever made.
Best wishes to you....
Susan