Indication: Feline upper respiratory infection (calicivirus / herpesvirus / chlamydophila) presenting with sneezing, oculonasal discharge, anorexia, and mild-to-moderate dehydration in an otherwise stable cat.

What this protocol does:
• Doxycycline PO q24h × 10 days — primary cover for Chlamydophila felis and Mycoplasma
• Nasal cleaning q8h — keeps the airway patent and improves appetite
• Appetite check q12h — anorexia is the highest-risk complication of feline URI

Notes: this is the lowest-intensity system protocol — there are no IV fluids and no IV medications. Use it for inpatients well enough to eat with encouragement and stay hydrated voluntarily.
Escalate if: anorexia > 24 hours, dehydration > 5%, marked dyspnoea, or eye involvement worsens — switch to IV support + ophthalmic care.