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My Shih Tzu has low blood counts and is lethargic. Is a biopsy needed?

Updated on September 23rd, 2025

Pet's info: Dog | Shih Tzu | Male | neutered | 5 years old | 24.6 lbs

My shitzu has low RBC and WBC and is very lethargic and tired and has been collapsing after excitement? Vet wants to do a bone marrow biopsy. Any ideas?

1 Answer

Most Helpful Answer

Daniel Fonza, DVM

Answered By Daniel Fonza, DVM

Veterinarian

Published on March 31st, 2018

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. There can be multiple causes of low RBCs and WBCs. I would make sure that all possible infectious causes are ruled out such as tick borne diseases. A chronic infection can cause low RBCs and low WBCs as well. Bone marrow could still be diseased and be leading to the low RBC and WBC count and a bone marrow biopsy in this case would prove to be useful. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.
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