Canine Infectious Hepatitis: Can It Be Treated

1 How the disease is diagnosed

Canine infectious hepatitis occurs worldwide and affects dogs of every age, sex, and breed, but newly weaned and dogs under one year old are the most vulnerable. Infection is usually through the mouth or nose, though it can also pass before birth from an infected mother. Puppies that catch the virus very young may die suddenly with no early symptoms, and recovered dogs can shed the virus in their urine for up to six months.

After a 2-9 day incubation, the body temperature climbs to 40-41C (104-106F) for one to six days in a distinct saddle-shaped curve. Affected dogs become dull and unwilling to eat, drink excessively, and develop conjunctivitis with watery eye and nose discharge, vomiting, diarrhea, abdominal pain, and yellowing of the gums. Bleeding takes longer to stop, and fluid collects under the skin, especially around the face. In recovery, roughly 25 percent of dogs develop a cloudy cornea, the tell-tale “blue eye.”

At post-mortem the abdomen often holds bloody fluid, the liver is enlarged and mottled, and the gallbladder wall is thick and edematous. Because the early signs resemble distemper and leptospirosis, diagnosis should never rest on symptoms alone. Confirmation comes from specific tests: fluorescent antibody staining, complement fixation, ELISA, agar gel diffusion, or viral isolation and culture.

2 Treatment options

There is no antiviral that directly clears CAV-1, so treatment is supportive and works best when started early. High-titer immune serum or antiviral agents such as Shuanghuanglian injection may be used in the first stage (about 1 mL per kg of body weight, once daily, by intramuscular injection).

Blood transfusions, intravenous fluids, and glucose help maintain circulation and energy, while liver-supportive drugs and broad-spectrum antibiotics limit secondary bacterial infection and improve the chance of recovery. Corneal cloudiness usually needs no treatment and clears on its own within about a week.

3 Prevention through vaccination

Good management matters: keep living areas clean and dry, disinfect regularly, and follow a routine parasite-control plan. The single most reliable defense, however, is vaccination.

Both inactivated and live vaccines are available. Adult dogs should be vaccinated once a year, while puppies receive two doses, at 8-9 weeks and again at 10-12 weeks of age. With consistent immunization, canine infectious hepatitis is almost entirely avoidable.