SYMPTOM
Fever
Owners may observe fever in their pet.
Various conditions
This symptom can occur in multiple conditions and warrants further assessment.
Why timing matters
Early observation
Early recognition allows prompt assessment and intervention if needed.
Later presentation
Persistent or worsening signs may indicate progression requiring attention.
The significance of this symptom depends on its context, duration, and associated findings.
Conditions commonly associated
Pneumonia
Elevated body temperature is common with active bacterial or viral pneumonia.
Pancreatitis in Dogs
Fever often accompanies pancreatitis as part of the inflammatory response within the pancreas and surrounding tissues. The elevation in body temperature tends to occur alongside abdominal pain and digestive signs in affected dogs.
Pneumonia
Fever is a common feature of pneumonia, reflecting the inflammatory and infectious processes within the lung tissue. The pyrexia typically occurs alongside respiratory signs such as coughing, increased breathing effort, and reduced exercise tolerance.
Otitis Externa in Dogs
Fever can occur in cases of otitis externa when bacterial infection within the ear canal becomes significant or spreads to deeper structures. The systemic response is more likely when the infection involves the middle ear or causes cellulitis of surrounding tissues.
Pancreatitis in Cats
Fever may accompany pancreatitis in cats, though the presentation in this species tends to be more subtle than in dogs. The pyrexia reflects pancreatic inflammation and can occur alongside vague signs such as lethargy and reduced appetite.
Feline Herpesvirus (FHV-1)
Fever can occur during acute flare-ups of feline herpesvirus infection, particularly in younger cats or those with compromised immunity. The elevated temperature typically accompanies upper respiratory signs such as sneezing, nasal discharge, and conjunctivitis.
When to explore further
When the symptom is persistent or worsening
When other signs are present alongside
When daily activities or quality of life are affected
When there is uncertainty about the cause
Noting when this symptom occurs, any triggers, and how it changes over time can provide useful information for veterinary discussions.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS