Captain Calamity's Latest Vet Visit

0:0 (used in e.g. UK) = A (used in e.g. Sweden) = ideal HD score.

The letter system only mentions two letters if they have different scores on their hips, as in e.g. A:B or C:A. So a single letter means that both hips got that score.

In Sweden both A and B hips is allowed to breed from, C hips in combination with a dog with A hips, this is to make sure that the gene pool is not harmed by minimizing the amount of dogs possible to breed from to much = leading to new, possibly worse, diseases/problems. D or E hips are not allowed to breed from.
I don't know which numbers that equals e.g. B and C but the basic reason for why not only dogs with 0:0 score is used in breeding is most likely the same in UK as here, it could make the gene pool to small.

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C & P of German scheme (for those who aren't too bored
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“a” 1 HD Normal - the best hip rating possible from the SV. Acceptable for breeding.
“a” 2 HD fast Normal - near normal hips. Acceptable for breeding with some caution.
“a” 3 HD noch Zugelassen - hips are still acceptable. Acceptable for breeding with great caution.
"a" 4 HD mittlere dysplasie - hips have mild dysplasia and are not acceptable for breeding.
"a" 5 HD schwere dysplasie - hips have severe dysplasia and are not acceptable for breeding.
 
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