The dog is said to have been in an area of ancient ruins in the city of Chihuahua, Mexico, in the late 1800s. How they actually got there is a mystery that cannot be answered for lack of witnesses, but there is speculation about their descent (1, 2).
Seattle's climate is classified as oceanic or temperate marine, with cool, wet winters and mild, relatively dry summers. The city and environs are part of USDA hardiness zone 8b, with isolated coastal pockets falling under 9a.
May weather in Seattle: May is generally a beautiful month in Seattle, with temperatures into the late teens and more days of sun and blue skies than rain. Even so, the evenings in May are chilly, and periods of rain are not uncommon, so a jacket and an umbrella are still a good idea.