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The Patterdale Terrier is an athletic Terrier and size wise they are generally anywhere between around 25–38cm or 10–15 inches. The old standard of 12" x 12" x 12" is still relevant today inasmuch as the Patterdale Terrier should be in proportion. See the explanation for the 12x12x12 on the Patterdale Terrier weight page. Therefore the height of your Patterdale will determine its weight. The height of a Patterdale, however is determined by a range of factors.
The Patterdale was originally developed as a working, hunting breed and initially that was solely what they were bred for. Breeders would choose their breeding stock based on its athleticism and its hunting instinct and ability.
Fortunately, because Patterdales are not a breed that is accepted by the kennel club and that is no bad thing, there are ‘guardians’ of the breed who breed good athletic true to type Patterdales. However, what it does mean is that the casual observer or pet owner does not have an easily accessible set standard to work too when considering a Patterdale or when deciding whether or not to breed from their terrier.
However, although showing Patterdale Terriers is not something that happens at the kennel club shows, there have for as long as there have been dogs as companions to humans been shows at gatherings and so forth. This has developed into more formal terrier shows and…