The half-breed Labrador and a shepherd photo.

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The half-breed Labrador and a East-European Shepherd photo.

In one landmark study, the effect of breed on longevity in the pet dog was analyzed using mortality data from 23,535 pet dogs. The data were obtained from North American veterinary teaching hospitals. The median age at death was determined for pure and mixed breed dogs of different body weights. Within each body weight category, the median age at death was lower for pure breed dogs compared with mixed breed dogs. The median age at death was "8.5 years for all mixed breed dogs, and 6.7 years for all pure breed dogs" in the study.

In 2013, a study found that mixed breeds live on average 1.2 years longer than pure breeds, and that increasing body-weight was negatively correlated with longevity (i.e. the heavier the dog the less its lifespan).

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East-European Shepherd

The East European Shepherd—also called the Owczarek Wschodnioeuropejski and Vostochnoevropejskaya Ovcharka (VEO)—is a breed of dog that was created by mixing German Shepherd Dogs with local Russian breeds in the 1930s.
These dogs were bred initially for military use.[citation needed]Modern East European Shepherd DNA bears both - traces of East Siberian Laika dogs and German Shepherds had been inherited by Russian Army from the territory of Germany during the Word war II.

Labrador Retriever

The Labrador Retriever (also Labrador, or Lab for short) is one of several kinds of retriever, a type of gun dog. A breed characteristic is webbed paws for swimming, useful for the breed's original purpose of retrieving fishing nets. The Labrador is the most popular breed of dog by registered ownership in Australia, Canada, New Zealand, the United Kingdom, and the United States (since 1991). It is also one of the most popular assistance dog breeds in Australia, Canada, the United Kingdom and the United States and many other countries, as well as being widely used by police and other official bodies for their detection and working abilities. Typically, Labradors are athletic and love to swim, play catch and retrieve games, are good with young children, elderly, and for protection. They are also used as guide dogs to help blind people.

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Dogs in Moscow, Russia.