I would suggest prostaglandin treatment be considered
http://www.marvistavet.com/html/body_pyometra.html
and more info here
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10213934&dopt=Abstract
http://www.showdogsupersite.com/kenlclub/breedvet/vpbxm1.html
I would suggest working with a vet who is a reproductive specialist and this site may help you find one
http://www.whelpwise.com/testing/veterinarian-links.html
Hope this helps you!
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