Shar-Pei: familial fever linked to the folds (HAS2) and health monitoring
A Shar-Pei with unexplained bouts of fever, and a swollen joint that resolves within a day or two, isn't reacting to an ordinary infection: these episodes are part of a hereditary inflammatory syndrome tied directly to what defines the breed, its thick folds. Find all our health guidance in the dog care and grooming section.
What the landmark study shows
Olsson and colleagues published a study in 2011 in PLoS Genetics identifying an unstable duplication upstream of the HAS2 gene that predisposes both to the Shar-Pei's characteristic skin phenotype and to a periodic fever syndrome (study on Google Scholar). The HAS2 gene encodes the enzyme that synthesises hyaluronic acid, responsible for the skin's thickness and folds; a high copy number of the duplication is associated with hyaluronic acid overproduction and the familial fever syndrome. When fragmented, this hyaluronic acid acts as an alarm signal for the innate immune system and triggers sterile fever and inflammation. In other words, intense selection for wrinkled skin has enriched the breed for a mutation that also predisposes it to these inflammatory flares.
Monitoring a predisposed dog
- Log the frequency and duration of fever episodes, a journal making veterinary follow-up and spotting any worsening easier.
- Stay alert to swollen joints or a puffy muzzle, classic flare signs to tell apart from an injury.
- Have kidney function checked regularly, since chronic inflammation can, over time, promote kidney damage.
Fold care remains essential to prevent local infection: our guide to Shar-Pei skin-fold care details the routine to follow. Since recurrent flares mean regular consultations, our guide to pet insurance for dogs helps you anticipate the cost. Find the full breed profile on the Shar-Pei page and browse all our guides on the dog hub.
Frequently asked questions
Do all Shar-Peis get familial fever?
No, but the genetic predisposition is very widespread in the breed; the intensity of flares varies greatly from one dog to the next.
Is a fever flare an emergency?
An isolated fever that resolves quickly can be managed with the vet, but a high, prolonged fever or one paired with marked lethargy warrants a prompt visit.
Can flares be prevented?
There is no full prevention, but regular follow-up and suitable vet-prescribed treatment help space out flares and protect the kidneys.
This guide is part of Planète Pets’s Dogs universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.