It is no longer common for pups to be born tailless though it does happen. One other member of this board had a litter of mostly tailless too. Would be interesting to see if the adults have any ancestors in common.
There is a well respected breeder here in the US who owned a male that sired a large percentage of tailess pups also
I personally would be interested in a copy of the litter's pedigree
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Diane
Frontier Rottweilers & Shiba Inu
www.frontierrots.com