Space biology arose at the intersection of a number of biological sciences, medicine (in particular, aviation), physics, chemistry, astronomy, geophysics, radiology, aerodynamics, radioelectronics and many other sciences.

A.Seryapin prepares Lisa Vtoraya (Fox the Second) and Bulba (Potato) for flight.
Research in the field of space biology and medicine is conducted in two directions:
-Laboratory experiments that create conditions that simulate space flight conditions;
-Experiments under real rocket flight conditions.

Space dog Veterok. Sensor installation.
Animals selected for space flight had to:
-be able satisfactorily endure the effects of the entire complex of space flight factors;
-tolerate long periods of exposure to small, confined spaces well when using special clothing and sensors;
-be easy to train.

The space dog Otvazhnaya. 1960.
Dogs were selected for space flights with white fur, this is due to the use of in-flight filming for monitoring animals.

Space dogs Zhemchuzhina and Otvazhnaya.
All pre-selected dogs were subjected to various tests over a long period of time, and those animals that passed all the tests with “good” and “excellent” marks were transferred to the category of four-legged cosmonaut candidates and were intended for large-scale flight experiments.

After qualifying tests
The selected dogs lived in a vivarium. There, square cages stood on tall, almost meter-long legs with wooden floors.

The dogs adapted well to their cages and, returning from a walk, jumped in as eagerly as they had left them. The dogs were fed twice a day. The diet included vegetables, fish, fat, meat, milk, and other products. Animals intended for difficult experiments were fed sausage, broth, canned food, sweets, and vitamins.
Data on the animals' behavior in the vivarium, during walks, and while eating, as well as their interactions with each other, their environment, and people, were collected and analyzed. This information helped to accurately understand the animals' reactions during and after experiments and determine the type of higher nervous activity.

Dogs Otvazhnaya (Brave) and Malyshka (Baby)
After studying the character and reaction of animals to everything around them, all dogs could be conditionally divided into 3 groups:

-Calm, moderately moving;
-Restless, more violent, moving;
-Lethargic, sleepy.

Squad of cosmonaut dogs
In long-term experiments, it is most effective to use calm animals. It was precisely on this basis that Cigan, Dezik, Laika, Strelka, Belka, Otvazhnaya, Chernushka, Zvezdochka, and others were selected.

Space Dogs Dezik and Cigan.