Morgan was born in Boston, MA and studied art with W.H.W. Bicknell. Most of his work was achieved as a author-illustrator, relating to the Dog.
In the Forties - his greatest success was acclaimed for his creation of the "Black and White Scotties", an advertisement used for many years by the Black and White Scotch Whiskey company.
Dennis was in constant demand by many magazines to illustrate his humorous conjectures of dogs and the shenanigans they sometimes conjure. His forte was the ability to enhance these situations on paper, with pencil and etching needle, and therein lies the success of their lasting appeal.
Source: "Dogs, Dogs, Dogs!" Egon and Joan Teichert Fine Prints Spring 1988