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After Vaccination: Fever and Poor Appetite—When to Return to the Vet

Normal vaccine reactions versus anaphylaxis timelines—what to monitor for 24-48 hours after shots.

PV
Pet NGON Vet PartnerVeterinary Advisor
calendar_todayJun 18, 2026schedule6 min readvisibility0 views
After Vaccination: Fever and Poor Appetite—When to Return to the Vet

Mild lethargy or a small lump at the injection site can be normal. Facial swelling, persistent vomiting, or collapse are emergencies.

Monitoring checklist

Temperature perception at home is unreliable—watch breathing, gum color, and willingness to walk.

Pet NGON may postpone grooming if your pet is febrile post-vaccine.


Book bathing once appetite and energy normalize per vet advice.

Next step: ER for swelling or collapse; otherwise call your clinic for mild prolonged fever.