Are you worried about the white blood cells from cows suffering from mastisis? If so, I wouldn’t be so specific.

All the components of milk come from the organisms’ blood before being secreted by the mammary gland.

Some clues from wikipedia:

“The earliest known dingo fossil, found in Western Australia, dates to 3,450 years ago. However, genomic analysis indicates that the dingo reached Australia 8,300 years ago but the human population which brought them remains unknown. Dingo morphology has not changed over the past 3,500 years: this suggests that no artificial selection has been applied over this period.”

“The dingo is closely related to the New Guinea singing dog”