Sometime in 1868, while Mary Anne was touring Devil's Acre with the Assassin Jacob Frye, the handbag containing Desmond was stolen by a thug. Jacob had to use his Eagle Vision ability to retrieve the dog back to his owner. While touring the slums, Desmond would bark loudly whenever threats to his mistress were near.
- The dog's name is a reference to Desmond Miles, the modern day protagonist of the original Assassin's Creed and its sequels.
- Desmond appears to be a Welsh Corgi, which is in-keeping with Mary Anne's Welsh origins. Queen Elizabeth II is famous for keeping a number of them as pets.