Badania porównawcze górnych dróg oddechowych u norwich terrierów, psów ras brachycefalicznych i mezocefalicznych

The following parameters obtained from the radiographs led to some contradictory conclusions

The S-index of 0.65 is far below the boundary value of 1.25 set between BC and Non-BC dogs (Balli, 2004). This means, that the facial skull has insufficient length, when compared to the cranial skull length. However, the measurements on the CFA and the LW-index would imply that the Norwich Terrier is not a brachycephalic dog. Ruchti (2009), who studied the skull shapes by comparison to the wolf, also reported that Norwich Terriers would not be brachycephalic, but did not use statistical methods. The confusion on the different indices cannot be solved definitely. However, the fact that one out of three indices points towards brachycephaly, must be taken into consideration. The statement from Ruchti (2009), that the skull shape of the Norwich Terrier is not brachycephalic, is challenged herewith.

The Norwich Terrier is a breed, whose skull shape has shows characteristics of brachycephaly. Although the length to width ratio and the craniofacial angle are similar to Beagle dogs, the relative length of the facial skull to the cranial skull seems to shorten in a way which is also known in brachycephalic dogs. This should alert the breeders, because the Norwich Terrier is now on a slow transition towards the shortening of the nose. As in all other breeds, this transition takes places in a broad spectrum of varities, in [...]

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