Definitely concur with a chihuaha but too difficult to speculate on anything else. Possibly a mixed terrier of sort. Back in the day we just, for lack of a better term, we just called them mutts...I adopted this guy a few weeks ago. He is approx 1 yr old, 14.5 pounds.
definitely part chihuahua, grump face makes me wonder if there’s some pug or brussels. Sort of long so wouldn’t rule out dachshund either.
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