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What are neutrophils and what does a "left shift" mean for my dog?

Updated On September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Male | neutered | 62 lbs

What are neutrophil Why does Rocco have them. Why shift to left side. What does that mean

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on June 17th, 2020

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Rocco. Neutrophils are the most common white blood cell in dogs. All dogs have them, and they are usually the first at the site of injury and infection to the dog. A left shift means there is the presence of immature neutrophils. Typically neutrophils are not released until they are fully mature, but can be released prematurely. This is usually done in response to an infection or inflammation. The bone marrow is producing more neutrophils and releasing them into the blood stream before they are mature. If he has a left shift, then there is an infection or inflammation present. His vet will have more information on what may be causing this left shift. I hope this explanation helps you!

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