Quote:
Originally Posted by ChuckElias
Interesting. I'm not sure my usage falls under the "slang" uses he mentions, but it's interesting to consider. I was using "like" to mean "akin to" (not really a simile), which I thought would be correct. I'd like to hear Juulie's thoughts on it.
Even tho Dan couldn't care less. 
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"Barking like a dog" is using "like" as a preposition, which is permitted, according to the Bartlesby link. The verb of the prepositional phrase is implied here ("Barking like a dog
does") to avoid stilted usage.
"I could care less" is a sarcastic abbreviation for "As if I could care less", or the more likely "Like I could care less". There is no punctuation for sarcasm, unfortunately. When will smilies be added to the grammar books?