I thought Toby was a basset hound, not a bloodhound.

In the Disney film, yes, Toby was a Basset Hound (very similar design to Lafayette from Aristocats). But in the Holmes stories, Toby's breed wasn't specified beyond being a hound. It is likely that Doyle intended him to be a scent hound (like a Beagle, or Bloodhound, or Foxhound) or a mix.

In the sketch Jim featured, I would guess that the artists were experimenting with design and breeds before a final was chosen. So Jim was stuck between identifying either the breed in the film or the sketch. Either choice was right and wrong.

P.S. Holmes trivia... Toby wasn't Holmes' dog either. He borrowed him from a friend, Sherman, for two adventures.

Thanx for the great article, Jim. I'm adding this one to my Amazon wishlist for Christmas!