Febrile neutropenia after chemotherapy in dogs
9-year-old Golden Retriever with multicentric lymphoma that received doxorubicin 7 days ago. It presents lethargic, inappetent and with a temperature of 40.1 °C.
What is the appropriate management?
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A. Hospitalise, take cultures without delaying treatment, start intravenous broad-spectrum antibiotics and fluid therapy, and postpone the next chemotherapy dose
Correct. Fever in a neutropenic dog is treated as sepsis until proven otherwise, usually due to bacterial translocation from the gut. After recovery, the oncologist usually reduces the dose of the responsible drug in subsequent cycles.
B. Oral antibiotics at home and continue chemotherapy on schedule
Outpatient oral antibiotics are an option for the afebrile, stable neutropenic dog, not for one that is febrile and lethargic. Giving more cytotoxics now would worsen myelosuppression.
C. Granulocyte colony-stimulating factor as the only treatment, without antibiotics
G-CSF may shorten neutropenia in selected cases, but it does not replace antibiotics: the patient may already be bacteraemic.
D. Meloxicam for the fever and repeat the haemogram in 48 hours
Lowering the fever does not treat the infection and delays treatment of potentially fatal sepsis; the NSAID also adds gastrointestinal and renal risk in a patient that may be hypovolaemic.
lightbulb Key takeaway
The neutrophil nadir of most chemotherapy drugs occurs around days 7–10: that is when to run the follow-up haemogram. In neutropenic patients signs of inflammation can be minimal, so fever or lethargy alone are enough to act.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.