The dog became ill after playing with a dead goose.
Investigators are working to determine the Chilean man's H5N1 exposure, and in Senegal, H5N1 has now infected a poultry flock.
Officials haven't said how the man was exposed to the virus, which had recently appeared in Chile's wild birds, poultry, and even some sea mammals.
Two of the outbreaks involved upland game bird farms, and another struck a live-bird market in New York's Queens County.
The illness is China's third involving H3N8 since 2022.
The detection involves a skunk found in Carter County, east of Amarillo.
In other avian flu developments, British officials report H5N1 detections in captive South America bush dogs and the US confirms more infections in poultry and mammals.
Researchers found H5N1 lineages unique to New England and novel amino acid changes, some linked to mammal adaptation.
The skunks were found dead in residential areas of Vancouver and a city just south of there, prompting warnings about handling sick and dead animals.
Though current 2.3.4.4b clade H5N1 viruses still prefer avian receptors, scientists are closely watching mutations that may influence virulence and replication in mammals.
