The use of todd derives from the name Todd as a reference to the Middle English word for "fox". The common term for a male fox, dog, could be confused for the gender-neutral term for a domesticated canine.
The family name is from Middle English todde (“fox"), a sign often used outside of roadside inns and adopted as a family name by those who lived there (compare Bush).
Todd Sentence Examples
For thirty years (1842-1872) Pittsfield was the home of the Rev. John Todd (1800-1873), the author of numerous books, of which Lectures to Children (1834; 2nd series, 1858) and The Student's Manual (1835) were once widely read.
Todd, A Letter 1 See a note in Archbishop Tenison's handwriting in his copy of the Eikon Basilike preserved at Lambeth Palace, and quoted in Almack's Bibliography, p. 15.