Doc Winner had a very long career in newspaper comics, the bulk of it spent picking up the pieces on strips that had lost their original creators. Tubby, in fact, is his only known credit on a strip of his own. The strip was offered by United Feature Syndicate back in the days when they were a tiny outfit with just a few offerings. Later on, of course, United Features would take over all the Pulitzer and Metropolitan strips and become a major name in the syndication business.
Tubby ran from March 19 1923 to June 5 1926 according to my best information, and the stock of dailies was then sold to reprint syndicates, so you’ll find the strip popping up later as well.
Winner’s next job, starting just a few months later, was to take over Just Boy from A.C. Fera, and Winner pretty quickly turned that strip into a continuation of Tubby. Elmer, the main character of Just Boy, became all but indistinguishable from the title character of this strip.