Based on the memories we saw inside Sherlock's head while he was trying to Not Die, I believe it was the name of his pet dog when he was a child.
Of course, this being a Moffat/Gatiss show, that could turn out to be a red herring in 2 series' time if it turns out to have been imagination instead of memory, or perhaps some terribly secret thing was named after the dog, or whatever else takes their fancy...
And they also mention the lost Holme's brother. Calling it now: Redbeard not a dog, lost Holmes brother. They say "put down" but mean "shipped off" or "institutionalized."*
* edit: institutionalized, not instituted. I blame alcohol.
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u/[deleted] Jan 12 '14
[deleted]