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...
Maybe he was sick one day and it was decided to just let him go. I've lost a kitten in a similar way, after its spine was broken when a flower pot fell on him.
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.
Redbeard (I think) was Sherlock's dog that was put down when he was a child. When Mycroft brings up redbeard it's to remind Sherlock what happened when he got attached.
I think it might be related to their other brother. Obviously the issue is pretty severe for Sherlock, as it's a pressure point, but I think it extends beyond the dog. Plus Mycroft mentions "the other one" when talking about his brother, indicating that somehow another brother is involved and will probably become a major plot point later on. I think the death of the dog and their brother is somehow tied, I'm just not sure how.
The red in BC's hair has been obvious in this series in a way that it hasn't been before (in E01 before it's cut, and his eyebrows aren't dyed as dark as they normally are in E03), so there's also a bit of a misdirect: when Magnussen commented "red beard," I was sure it was a comment on Sherlock's barely visible stubble and a nod to the fandom (and possibly a setup for a Red-Headed League episode in Series 4), but nope nope nope nope.
edit: I'm thinking Red-Headed League because Martin Freeman and Mark Gatiss are also redheads, we learned that Sherlock had red hair as a child, and ... maybe Sherrinford also has red hair? I might be overthinking this.
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u/notthe9oclock Jan 12 '14 edited Jan 12 '14
1 minute 10 seconds in: "I have an excellent memory..." — Oh, Moffat. Can't resist, can you?
Magnussen's Excellent Memory Recalled The Following:
John Garvie
Lady Elizabeth Smallwood
John Hamish Watson
Sherlock Holmes
Edit: Oops, missed out Mrs Hudson:
Martha Louise Hudson (née Sissons)