The little dogs here are actually Field Spaniels. Field Spaniels were one of the first examples of extreme breeding. At the beginning of the 20th Century they were bred to be very short-legged for the show ring, but breeders began to realise that this affected their health and their ability to work, so the leg length was then reversed over the course of a few decades, creating the breed we know today. Most of the original Field Spaniels were black or blue roan, and the more popular liver colour seen today was most likely introduced through later crossbreeding with English Springers, which was done to lengthen the leg.
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https://www.facebook.com/VintageDogADay?fref=ts og http://www.doggenetics.co.uk/
Image and text are borrowed with approval from
https://www.facebook.com/VintageDogADay?fref=ts and http://www.doggenetics.co.uk/