Edward Penfield (1866-1925) has always been one of my favorite illustrators. He was considered "The Father of the American Poster," but also contributed covers and other artwork to just about all the popular magazines of his day. Here's his cover for the May 1897 edition of Harper's magazine:
He portrayed people at work and play - sometimes along with their pets, as in this calendar also from 1897.
He seemed to be especially fond of cats - he even used one for his personal bookplate.