Recent hot and humid weather has contributed to the outbreak, which is transmitted through the hair or feet of infected dogs, contaminated shoes and clothing.

Dogs and puppies that become infected will usually become ill within 7-10 days of the initial infection.

"Adult dogs don't necessarily need a booster if they have already had their shots.

"However it is critical that puppies are vaccinated," Australian Veterinary Association president Dr Rod Starr said.

Symptoms include vomiting, loss of appetite, fever and diarrhoea.

Unvaccinated puppies are most at risk of infection, although adult dogs can also become infected.

Infected dogs have just a 50per cent chance of survival.

Most vets recommend vaccinating puppies every three to four weeks, starting at six weeks of age.

Details: www.ava.com.au