LOS ANGELES — An outbreak of canine flu has sickened more than 1,000 dogs in the Midwest, killing a handful and stirring concern among animal lovers nationwide that the highly contagious virus will sideline their pets.

Experts blame the epidemic on a strain called H3N2 that is seen in Asia and leaves pets feeling lousy for about two weeks. Veterinarians believe the strain, which doesn’t yet have a vaccine, will likely spread to other parts of the country, so they are offering ways to keep pets healthy or help those that are already ill.

What to look for

Steve Gilberg, a digital marketer in Chicago, says his 6-year-old pug-Chihuahua mix, Joey, had most of the symptoms: high fever, runny nose, watery eyes, sore throat and loss of appetite. But mostly, he coughed.

“He just started coughing really, really hard, kind of like a smoker’s hacking cough, coming from the belly,” Gilberg said.

Dr. Brian Collins urges owners to pay attention to changes in behavior, such as dwindling interest in eating, drinking and playing, labored or rapid breathing, or lethargy.

Helping sick pets

Start by taking its temperature. You can’t just feel your dog’s forehead to see if it’s running a fever, but digital thermometers can take readings under an armpit or in the most accurate area — the backside, Collins said.

Food and fluids are important, so keep trying to entice your buddy. With a pet that isn’t eating well, offer fare that’s a bit more tempting, but be careful it doesn’t cause a stomachache. Try some baby food, canned meals or dry food softened with water.

Dogs probably have achy muscles, a sore throat and stuffy head, while feeling tired and run down, so don’t discourage long bouts of snoozing as long as they are getting up to go outside and staying hydrated.

Avoid germs

Infected dogs can be contagious for two weeks, so keep pets — sick or healthy — away from other pooches and places where they gather, such as doggie day cares, dog parks, groomers and pet stores.

The virus gets passed through the air when dogs sneeze or by people when germs jump on hands or clothing, where they can live for hours. But the canine flu doesn’t sicken people.

When medicine helps

There is no vaccine for the strain sweeping through Illinois, Wisconsin, Ohio and Indiana. Shots are available for a similar strain seen last year, and some vets believe it could help ward off germs.

But there’s no need to vaccinate dogs that are already sick, said Dr. Drew Sullivan of the Medical District Veterinary Clinic in Chicago.