Officials at the N.J. State Department of Health have seen enough cases of the dog flu to issue a notice telling animal facilities and veterinarians to be on the lookout.

Cases have been spotted in Burlington, Mercer and Sussex counties.

The virus is highly contagious and symptoms can show up quickly.

Symptoms of canine influenza are similar to "kennel cough," and include cough, high fever, nasal discharge and decreased appetite.

In severe cases, the flu can lead to pneumonia, but it's rare.

"The average pet owner need not be alarmed about this because it's not going to pop up in your dog in your neighborhood, on your block," said Dr. Michael Moyer, of the University of Pennsylvania vet school.

"It's much more likely if your dog goes to a facility where large numbers of animals are housed."

Moyer said the movement of dogs from other areas in and out of the facility increases the risk.

A blood test can detect the illness but there is no real treatment or vaccine.

"If they have flu they generally just need good supportive care," Moyer said. "Keep them eating, keep them drinking, keep them hydrated and like most mild forms of influenza in people, you get over it."

To reduce the spread of the disease, don't let dogs lick each other, don't let them share water bowls and avoid dog parks, pet stores and other crowded places.