The dog looks like my (dear, departed) dog Lace, aka The Ferocious Arctic Wolf. (My younger daughter named him Lace. He considered himself a Ferocious Arctic Wolf.) He was, as best we could tell, a Norwich Terrier.
No, he was a cattle dog in his younger days. It required the attitude of a ferocious arctic wolf to keep 5000 pounds of beef moving around at the behest of a 10 pound dog. I'm sure he thought "Lace" meant "Canine Stud Muffin." Amanda never told him otherwise.
As a mother of a slouching teen that dresses pretty much like that one (sans hat), I do find them adorable. I suspect this is some kind of genetic/hormonal thing related to not quite being finished protecting them yet.