To judge whether the Soviet Red Dog is pure, you can observe it from the following aspects:

1. Size and appearance: The weight of the Soviet Red Dog is usually between 30 and 45 kilograms. Adult male dogs The height of the dog is about 75~80cm, and the height of the adult female dog is about 60~70cm.

2. Pedigree certificate: Purebred Soviet Red dogs usually have a purebred identification certificate in the kennel, which can be used as a basis for judging their purebredness. At the same time, you can also learn about the pedigree of its parent dogs and further determine its purebred nature.

3. Price factor: Although price cannot be the only criterion for judging purebredness, generally speaking, The slightly more expensive Soviet Red dogs are more likely to be purebred.

Please note that the judgment of a purebred dog is not achieved overnight, but requires comprehensive consideration of many factors.