The degree of English Greyhound blodlines in the Borzoi is an ongoing discussion.
The degree of foreign breeds in the borzoi is very much related to the onoing debate concerning the black color in borzoi. Have Greyhounds had a role in introducing black in borzois, was breeds like Gromskaya or Krimskaya also involved or had it always present in the breed. This will not be solved before thorough DNA testing has been done. The result will peraps be that the influence is only slightly or not ar all traceable.