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How many man-made dog breeds are there? Some have counted as many as 167. But how have they changed over time? The Science and Dogs blog tried to compare today's photos with those that appeared 100 years ago in the book "Dogs of all nations" (1915). The juxtaposition of the photos demonstrates how the crosses and the selection has shaped and transformed some breeds.

The Basset Hound yesterday and today. The Basset Hound is a breed created in France and then imported to England in the 1800s and then again developed in the US. Today it appears lower than in the past and even the ears seem larger

The Bull Terrier yesterday and today. It is the breed that has undergone the most obvious transformation. In the book "Dogs of all nations", it appears much more slender and above all with a more natural face. Now the muzzle is more pointed and the abdomen is also very different.

The Bull Terrier is a breed born in Great Britain. It was used mainly in fighting with the bulls.

The German shepherd yesterday and today. The hind legs today are lower than in the past. In "Dogs of Nation" the German shepherd was described as a quick and agile animal. Today it has become much more massive and heavy.

Il Carlino yesterday and today. Today's pug is smaller than the previous one. It is reduced by selection. The pug arrived in Europe between the 16th and 17th centuries from China.

The dachshund yesterday and today. The dachshund (Dachshund) is a creation of German breeders. Compared to the past, it has stretched and the legs have been extremely shortened.

The San Bernardo yesterday and today. The San Bernardo of today is much larger than the past, while the muzzle appears shorter. It is thought that the origin of the breed dates back to the large mastiffs that the Roman legions left with the troops destined to preside over the strategic points on the major roads. Its name derives from the fact that they were used in the Hospice located on Colle San Bernardo around 1660 both as rescue dogs and for other uses

The English bulldog yesterday and today. Shorter legs and more flattened snout. As the name implies, the bulldog was "born" as a fighting dog against bulls.

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