1. A case history of the Pelger-Huët leukocyte anomaly in the dog is presented. The trait appears similar to that observed in humans and rabbits.
2. Disappearance from the circulation of transfused Pelger-Huët neutrophils was exponential with a T1/2 value of 4.8 hours.
3. Transfused PelgerHuët eosinophils rapidly disappeared from the circulation with a T1/2 value approaching 30 minutes.