This is from December last year. Here is the original description:

Toby, as described in "The Sign of Four" aka Sherlock Holmes' dog. Toby, however doesn't even belong to Sherlock at all!

I just added this to the wiki entry because I was shocked he was missing from the minor characters entry of Sherlock Holmes characters so here you go:

--Toby is a dog who is used by Sherlock Holmes. He is first introduced in The Sign of the Four and is described by Watson as a "ugly long haired, lop-eared creature, half spaniel and half lurcher, brown and white in colour, with a very clumsy waddling gait." Though used by Holmes, the dog belongs to Mr. Sherman who keeps a menagerie of creatures at No. 3 Pinchin Lane in Lambeth. Toby lives at No. 7 within his house. Holmes states he would "rather have Toby's help than that of the whole detective force in London." and requests the dog by name.--

I wanted to draw him because he looks nothing like the dog in the Disney film "The Great Mouse Detective" who is obviously a Basset Hound. I do love that movie though, so I gave him the big giant nose given to him from that design. :P