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But when the grief-stricken Giovanni Scarpazza and his hunting dogs Aria and Fagiolo chance upon an unusual truffle, Mayor Delizia Micucci allows herself to hope that big-ticket players in the food world will bite at the chance to own it.

On its website, Feather Ranch advertises puppies, training programs for hunting dogs and adoption programs.

For a recent study, Dr. Brown and his colleagues analyzed blood samples from nearly 200 hunting dogs in Washington.

“And we looked specifically at waterfowl hunting dogs because they are going to be the ones that are actively in infected habitats and retrieving infected birds in their mouth,” Dr. Brown said.

She also pointed to new research showing H5N1 antibodies in a group of Washington state hunting dogs trained to retrieve waterfowl, a carrier of the disease.