In the books there is a dog named Toby so instead of Molly having a cat, maybe she is meticulous about not leaving traces on clothes (smell, boss allergic to dog hair etc.) but picks up cat hair from a stray or volunteering in an animal shelter in the mornings.
Sherlock only finds out at end of season two.
Bonus Irish-wolf hound, love the idea of Molly having a dog not only of breeds physical traits (tallest of all dogs) and intelligence but also loyalty toward owner.
Toby is a Dog, Sherlock got it wrong Molly never corrected
In the books there is a dog named Toby so instead of Molly having a cat, maybe she is meticulous about not leaving traces on clothes (smell, boss allergic to dog hair etc.) but picks up cat hair from a stray or volunteering in an animal shelter in the mornings.
Sherlock only finds out at end of season two.
Bonus
Irish-wolf hound, love the idea of Molly having a dog not only of breeds physical traits (tallest of all dogs) and intelligence but also loyalty toward owner.